View source for 17 (number)

{{Infobox number
| number =  17
| numeral = septendecimal
| factorization = [[Prime number|prime]]
| prime = 7th
| divisor = 1, 17
}}
'''17''' ('''seventeen''') is the [[Natural number|natural number]] following [[16 (number)|16]] and preceding [[18 (number)|18]]. It is a [[Prime number|prime number]].

Seventeen is the sum of the first four prime numbers.

==In mathematics==
'''Seventeen''' is the seventh [[Prime number|prime number]], which makes it the fourth [[Super-prime|super-prime]],<ref>{{Cite OEIS |A006450 |Prime-indexed primes: primes with prime subscripts. |access-date=2023-06-29 }}</ref> as [[7|seven]] is itself prime. It forms a [[Twin prime|twin prime]] with [[19 (number)|19]],<ref>{{Cite OEIS |A001359 |Lesser of twin primes |access-date=2022-11-25 }}</ref> a [[Cousin prime|cousin prime]] with [[13 (number)|13]],<ref>{{Cite OEIS |A046132 |Larger member p+4 of cousin primes |access-date=2022-11-25 }}</ref> and a [[Sexy prime|sexy prime]] with both [[11 (number)|11]] and [[23 (number)|23]].<ref>{{Cite OEIS |A023201 |Primes p such that p + 6 is also prime. (Lesser of a pair of sexy primes) |access-date=2022-11-25 }}</ref> Seventeen is the only prime number which is the sum of ''four'' consecutive primes ([[2|2]], [[3|3]], [[5|5]], and [[7|7]]), as any other four consecutive primes that are added always generate an even number divisible by two. It is one of six [[Lucky numbers of Euler|lucky numbers of Euler]] which produce primes of the form <math>k^{2}-k+41</math>,<ref>{{Cite OEIS |A014556 |Euler's "Lucky" numbers |access-date=2022-11-25 }}</ref> and the sixth [[Mersenne prime]] exponent, which yields 131,071.<ref>{{Cite OEIS |A000043 |Mersenne exponents |access-date=2022-11-25 }}</ref> It is also the minimum possible number of givens for a [[Sudoku|sudoku]] puzzle with a unique solution.<ref>{{cite arXiv|last=McGuire|first=Gary|title=There is no 16-clue sudoku: solving the sudoku minimum number of clues problem|eprint=1201.0749|class=cs.DS|year=2012}}</ref><ref>{{Cite journal |last1=McGuire |first1=Gary |last2=Tugemann |first2=Bastian |last3=Civario |first3=Gilles |s2cid=8973439 |date=2014 |title=There is no 16-clue sudoku: Solving the sudoku minimum number of clues problem via hitting set enumeration |journal=Experimental Mathematics |volume=23 |issue=2 |pages=190–217 |doi=10.1080/10586458.2013.870056 }}</ref> 17 can be written in the form <math>x^y + y^x</math> and <math>x^y - y^x</math>; and as such, it is a [[Leyland number#Leyland primes|Leyland prime]] and [[Leyland number#Leyland number of the second kind|Leyland prime of the second kind]]:<ref>{{Cite OEIS |A094133 |Leyland primes |access-date=2022-11-25 }}</ref><ref>{{Cite OEIS |A045575 |Leyland primes of the second kind |access-date=2022-11-25 }}</ref>
:<math>2^{3} + 3^{2} = 17 = 3^{4} - 4^{3}</math>

17 is the third Fermat prime, as it is of the form <math>2^{2^{n}} + 1</math> with <math>n = 2</math>.<ref>{{Cite web|url=https://oeis.org/A019434|title=Sloane's A019434 : Fermat primes|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-01}}</ref> On the other hand, the seventeenth [[Jacobsthal number|Jacobsthal–Lucas number]] — that is part of a [[Sequence|sequence]] which includes four Fermat primes (except for [[3|3]]) — is the fifth and largest known Fermat prime: [[65,537|65,537]].<ref>{{Cite OEIS |A014551 |Jacobsthal-Lucas numbers. |access-date=2023-06-29 }}</ref> It is one more than the smallest number with exactly seventeen [[Divisor|divisor]]s, 65,536 = 2<sup>16</sup>.<ref>{{Cite OEIS |A005179 |Smallest number with exactly n divisors. |access-date=2023-06-28 }}</ref> Since seventeen is a Fermat prime, regular [[Heptadecagon|heptadecagon]]s can be [[Constructible polygon|constructed]] with a [[Physics:Compass|compass]] and unmarked ruler. This was proven by [[Biography:Carl Friedrich Gauss|Carl Friedrich Gauss]] and ultimately led him to choose mathematics over philology for his studies.<ref>John H. Conway and Richard K. Guy, ''The Book of Numbers''. New York: Copernicus (1996): 11. "Carl Friedrich Gauss (1777–1855) showed that two regular "heptadecagons" (17-sided polygons) could be constructed with ruler and compasses."</ref><ref>Pappas, Theoni, ''Mathematical Snippets'', 2008, p. 42.</ref>

Either 16 or 18 [[Unit square|unit square]]s can be formed into rectangles with perimeter equal to the area; and there are no other [[Natural number|natural number]]s with this property. The Platonists regarded this as a sign of their peculiar propriety; and [[Philosophy:Plutarch|Plutarch]] notes it when writing that the Pythagoreans "utterly abominate" 17, which "bars them off from each other and disjoins them".<ref>{{Cite book|last=Babbitt|first=Frank Cole|title=Plutarch's Moralia|publisher=Loeb|year=1936|volume=V|url=https://penelope.uchicago.edu/Thayer/E/Roman/Texts/Plutarch/Moralia/Isis_and_Osiris*/C.html#42}}</ref> 

17 is the minimum number of [[Vertex (geometry)|vertices]] on a [[Graph (discrete mathematics)|graph]] such that, if the [[Edge (geometry)|edges]] are colored with three different colors, there is bound to be a [[Monochromatic triangle|monochromatic triangle]]; see [[Ramsey's theorem#A multicolour example: R.283.2C3.2C3.29 .3D 17|Ramsey's theorem]].<ref>{{Cite OEIS |A003323 |Multicolor Ramsey numbers R(3,3,...,3), where there are n 3's. |access-date=2022-11-25 }}</ref>

There are also:

* 17 [[Space group#Classification systems|crystallographic space groups]] in two dimensions.<ref>{{Cite OEIS |A006227 |Number of n-dimensional space groups (including enantiomorphs) |access-date=2022-11-25 }}</ref> These are sometimes called [[Wallpaper group|wallpaper group]]s, as they represent the seventeen possible symmetry types that can be used for wallpaper. 

* 17 combinations of regular polygons that completely [[Vertex (geometry)#Of a plane tiling|fill a plane vertex]].<ref>{{citation|title=The Elements of Plane Practical Geometry, Etc|first=Elmslie William|last=Dallas|publisher=John W. Parker & Son|year=1855|page=134|url=https://books.google.com/books?id=y4BaAAAAcAAJ&pg=PA134}}.</ref> Eleven of these belong to regular and semiregular tilings, while 6 of these (3.7.42,<ref>{{Cite web|url=http://gruze.org/tilings/3_7_42_shield|title=Shield - a 3.7.42 tiling|website=Kevin Jardine's projects|publisher=Kevin Jardine|access-date=2022-03-07}}</ref> [[Icositetragon#Related polygons|3.8.24]],<ref>{{Cite web|url=http://gruze.org/tilings/dancer|title=Dancer - a 3.8.24 tiling|website=Kevin Jardine's projects|publisher=Kevin Jardine|access-date=2022-03-07}}</ref> [[Octadecagon#Uses|3.9.18]],<ref>{{Cite web|url=http://gruze.org/tilings/3_9_18_art|title=Art - a 3.9.18 tiling|website=Kevin Jardine's projects|publisher=Kevin Jardine|access-date=2022-03-07}}</ref> [[Pentadecagon#Uses|3.10.15]],<ref>{{Cite web|url=http://gruze.org/tilings/3_10_15_fighters|title=Fighters - a 3.10.15 tiling|website=Kevin Jardine's projects|publisher=Kevin Jardine|access-date=2022-03-07}}</ref> [[Icosagon#Uses|4.5.20]],<ref>{{Cite web|url=http://gruze.org/tilings/compass|title=Compass - a 4.5.20 tiling|website=Kevin Jardine's projects|publisher=Kevin Jardine|access-date=2022-03-07}}</ref> and 5.5.10)<ref>{{Cite web|url=http://gruze.org/tilings/5_5_10_broken_roses|title=Broken roses - three 5.5.10 tilings|website=Kevin Jardine's projects|publisher=Kevin Jardine|access-date=2022-03-07}}</ref> exclusively surround a point in the plane and fill it only when irregular polygons are included.<ref>{{Cite web|url=https://blogs.ams.org/visualinsight/2015/02/01/pentagon-decagon-packing/|title=Pentagon-Decagon Packing|website=American Mathematical Society|publisher=AMS|access-date=2022-03-07}}</ref> 

* 17 orthogonal curvilinear coordinate systems (to within a conformal symmetry) in which the three-variable Laplace equation can be solved using the [[Separation of variables|separation of variables]] technique.

* 17 distinct [[Stellation#Stellating polyhedra|fully supported stellations]] generated by an [[Regular icosahedron|icosahedron]].<ref name="Stellations">{{Cite web |url=https://www.software3d.com/Enumerate.php |last=Webb |first=Robert |title=Enumeration of Stellations |website=www.software3d.com |access-date=2022-11-25 |archive-url=http://archive.today/2022.11.26-015207/https://www.software3d.com/Enumerate.php |archive-date=2022-11-25 }}</ref> The seventeenth prime number is [[59 (number)|59]], which is equal to the total number of stellations of the icosahedron by [[Stellation#Miller's rules|Miller's rules]].<ref>{{Cite book |author1=H. S. M. Coxeter |author2=P. Du Val |author3=H. T. Flather |author4=J. F. Petrie |title=The Fifty-Nine Icosahedra |publisher=Springer |location=New York |year=1982 |doi=10.1007/978-1-4613-8216-4 |isbn=978-1-4613-8216-4 }}</ref><ref>{{Cite OEIS |A000040 |The prime numbers |access-date=2023-02-17 }}</ref> Without counting the icosahedron as a ''zeroth'' stellation, this total becomes [[58 (number)|58]], a count equal to the sum of the first seven prime numbers (2 + 3 + 5 + 7 ... + 17).<ref>{{Cite OEIS|A007504 |Sum of the first n primes. |access-date=2023-02-17 }}</ref>
:17 distinct fully supported stellations are also produced by [[Truncated cube|truncated cube]] and [[Truncated octahedron|truncated octahedron]].<ref name="Stellations"/>

* 17 four-dimensional [[Parallelohedron|parallelotopes]] that are [[Zonohedron#Zonotopes|zonotopes]]. Another 34, or twice 17, are Minkowski sums of zonotopes with the [[24-cell|24-cell]], itself the simplest parallelotope that is not a zonotope.<ref>{{cite journal|last1=Senechal|first1=Marjorie|last2=Galiulin|first2=R. V.|hdl=2099/1195|issue=10|journal=Structural Topology|language=en,fr|mr=768703|pages=5–22|title=An introduction to the theory of figures: the geometry of E. S. Fedorov|year=1984}}</ref> 

Seventeen is the highest dimension for paracompact Vineberg polytopes with rank <math>n+2</math> mirror [[Facet (geometry)|facets]], with the lowest belonging to the third.<ref>{{cite journal |last=Tumarkin |first=P.V. |date=May 2004 |title=Hyperbolic Coxeter N-Polytopes with n+2 Facets |journal=Mathematical Notes |url=https://doi.org/10.1023/B:MATN.0000030993.74338.dd |volume=75 |issue=5/6 |pages=848–854 |doi=10.1023/B:MATN.0000030993.74338.dd |arxiv=math/0301133 |access-date=18 March 2022}}</ref>

17 is the longest sequence for which a solution exists in the [[Irregularity of distributions|irregularity of distributions]] problem,<ref>{{cite journal|author1=[[Biography:Elwyn Berlekamp|Berlekamp, E. R.]] |author2=Graham, R. L. |title=Irregularities in the distributions of finite sequences
 | journal = [[Journal of Number Theory]]|volume=2|year=1970|issue=2 |pages=152–161|mr=0269605|doi=10.1016/0022-314X(70)90015-6|bibcode=1970JNT.....2..152B |doi-access=free}}</ref> while the sequence of residues (mod {{mvar|n}}) of a [[Googol#Properties|googol]] and [[Googolplex#Mod n|googolplex]], for <math>n=1, 2, 3, ...</math>, agree up until <math>n=17</math>.

In [[Abstract algebra|abstract algebra]], 17 is the seventh ''[[Supersingular prime (moonshine theory)|supersingular prime]]'' that divides the [[Order (group theory)|order]] of six [[Sporadic group|sporadic group]]s ([[Janko group J3|''J<sub>3</sub>'']], [[Held group|''He'']], [[Fischer group Fi23|''Fi<sub>23</sub>'']], [[Fischer group Fi24|''Fi<sub>24</sub>'']], [[Baby monster group|''B'']], and [[Monster group|''F<sub>1</sub>'']]) inside the [[Sporadic group#Happy Family|Happy Family]] of such groups.<ref>{{Cite OEIS |A002267 |The 15 supersingular primes |access-date=2022-11-25 }}</ref> The 16th and 18th prime numbers ([[53 (number)|53]] and [[61 (number)|61]]) are the only two primes less than [[71 (number)|71]] that do not divide the [[Order (group theory)|order]] of any sporadic group including the [[Pariah group|pariahs]], with this prime as the largest such supersingular prime that divides the largest of these groups (''F<sub>1</sub>''). On the other hand, if the [[Tits group]] is included as a ''non-strict'' group of [[Group of Lie type|Lie type]], then there are seventeen total classes of [[Lie group]]s that are simultaneously [[Finite group|finite]] and [[Simple group|simple]] (see, [[Classification of finite simple groups|classification of finite simple groups]]). In base ten, (17, 71) form the seventh permutation class of [[Permutable prime|permutable prime]]s.<ref>{{Cite OEIS |A258706 |Absolute primes: every permutation of digits is a prime. Only the smallest representative of each permutation class is shown. |access-date=2023-06-29 }}</ref>

A positive [[Definite quadratic form|definite quadratic]] [[Integer matrix|integer matrix]] represents all [[Prime number|primes]] when it contains at least the set of seventeen numbers: {2, 3, 5, 7, 11, 13, ''17'', 19, 23, 29, 31, 37, 41, 43, 47, 67, 73}; only four prime numbers less than the largest member are not part of the set (53, [[59 (number)|59]], 61, and 71).<ref>{{Cite OEIS |A154363 |Numbers from Bhargava's prime-universality criterion theorem }}</ref>

==In science==
* The [[Physics:Atomic number|atomic number]] of [[Chemistry:Chlorine|chlorine]].
* The [[Biology:Brodmann area|Brodmann area]] defining the [[Biology:Occipital lobe|primary visual processing area]] of mammalian brains.
* [[Chemistry:Group (periodic table)|Group 17]] of the [[Chemistry:Periodic table|periodic table]] is called the halogens.
* The number of elementary particles with unique names in the [[Physics:Standard Model|Standard Model]] of physics.<ref>{{cite journal|url=http://physics.info/standard/|title=The Standard Model|author=Glenn Elert|journal=The Physics Hypertextbook|year=2021}}</ref>

==In languages==

===Grammar===
In Catalan, 17 is the first compound number ({{lang|ca|disset}}). The numbers 11 ({{lang|ca|onze}}) through 16 ({{lang|ca|setze}}) have their own names.

In French, 17 is the first compound number ({{lang|fr|dix-sept}}). The numbers 11 ({{lang|fr|onze}}) through 16 ({{lang|fr|seize}}) have their own names.

==Age 17==
* In most countries across the world, it is the last age at which one is considered a minor under law.
* In the UK, the minimum age for taking driving lessons, and to drive a car or a van 
* In the US and Canada, it is the age at which one may purchase, rent, or reserve M-rated video games without parental consent
* In some US states,<ref>{{cite web|url=http://www.age-of-consent.info/|archive-url=https://web.archive.org/web/20110417024317/http://www.age-of-consent.info/|url-status=dead|archive-date=2011-04-17|title=Age Of Consent By State}}</ref> and some jurisdictions around the world, 17 is the age of sexual consent<ref>{{cite web|url=http://www.avert.org/age-of-consent.htm|title=Age of consent for sexual intercourse|date=2015-06-23}}</ref> 
* In most US states, Canada and in the UK, the age at which one may donate blood (without parental consent)
* In many countries and jurisdictions, the age at which one may obtain a driver's license
* In the US, the age at which one may watch, rent, or purchase R-rated movies without parental consent
*The U.S. TV Parental Guidelines system sets 17 as the minimum age one can watch programs with a TV-MA rating without parental guidance.
* In the US, the age at which one can enlist in the armed forces with parental consent 
* In the US, the age at which one can apply for a private pilot licence for powered flight (however, applicants can obtain a student pilot certificate at age 16)
* In Greece and Indonesia, the voting age
* In Chile and Indonesia, the minimum driving age.
* In Tajikistan, North Korea and Timor-Leste, the age of majority

==In culture==
===Music===

====Bands====
* 17 Hippies, a German band
* Seventeen ({{Lang|ko|세븐틴}}), a South Korean boy band
* Heaven 17, an English new wave band
* East 17, an English boy band

====Albums====
* ''17'' (XXXTentacion album)
* ''17'' (Motel album)
* ''17'' (Ricky Martin album)
* ''Chicago 17'', a 1984 album by Chicago
* ''Seventeen Days'', a 2005 album by 3 Doors Down
* ''Seventeen Seconds'', a 1980 album by the Cure
* ''17 Carat'', a 2015 EP by Seventeen
* ''Sector 17'', a 2022 repackaged album by Seventeen

====Songs====
* "17 Again", a song by Tide Lines
* "17" (Sky Ferreira song)
* "17" (Yourcodenameis:Milo song)
* "17 Again", a song by Eurythmics
* "17 år", a song by Veronica Maggio
* "17 Crimes", a song by AFI
* "17 Days", a song by Prince
* "17", a song by Dan Bălan
* "17", a song by Jethro Tull
* "17", a song by Kings of Leon
* "17", a song by Milburn
* "17", a song by Rick James from ''Reflections''
* "17", a B-side by Shiina Ringo on the "Tsumi to Batsu" single
* "17", a song by the Smashing Pumpkins from the album ''Adore''
* "17", a song by Youth Lagoon from the album ''The Year of Hibernation''
* "17 Days", a song by Prince & the Revolution, B side from the 1984 "When Doves Cry" single
* "Seventeen" (Jet song)
* "Seventeen" (Ladytron song)
* "Seventeen" (Winger song)
* "Seventeen", a song by ¡Forward, Russia! from ''Give Me a Wall''
* "Seventeen", a song by Jimmy Eat World from ''Static Prevails''
* "Seventeen", a song by Marina & the Diamonds from the US edition of ''The Family Jewels''
* "Seventeen", a song by Mat Kearney from the iTunes edition of ''Young Love''
* "Seventeen", a song from the ''Repo! The Genetic Opera'' soundtrack
* "Seventeen", the original title of the song "I Saw Her Standing There" by The Beatles
* "Seventeen", a song by the Sex Pistols from ''Never Mind the Bollocks, Here's the Sex Pistols''
* "Seventeen Forever", a song by Metro Station
* "At Seventeen", a song by Janis Ian
* "Edge of Seventeen", a song by Stevie Nicks
* "Seventeen Ain't So Sweet", a song by The Red Jumpsuit Apparatus from ''Don't You Fake It''
* "Only 17", a song by [[Biography:Rucka Rucka Ali|Rucka Rucka Ali]]
* "Opus 17 (Don't You Worry 'Bout Me)", a song by Frankie Valli and the Four Seasons
* "(She's) Sexy + 17", a song by Stray Cats from ''Rant N' Rave with the Stray Cats''
* "Hello, Seventeen", a song by 12012
* "Section 17 (Suitcase Calling)", a song by The Polyphonic Spree
* "Day Seventeen: Accident?", a song by Ayreon
* "Seventeen", a song by Alessia Cara
* "Seventeen", a song performed by Marina and the Diamonds
* "Seventeen" and "Seventeen (Reprise)", songs in the musical ''Heathers''
* "Seventeen" and "Seventeen (Reprise)", songs in the musical ''Tuck Everlasting''

====Other====
* ''Seventeen'', a 1951 American musical
* The ratio 18:17 was a popular approximation for the equal tempered semitone during the Renaissance

===Film===
* ''Seventeen'' (1916), an adaptation of the novel of the same name by Booth Tarkington
* ''Number 17'' (1928), a British-German film
* ''Number Seventeen'' (1932), directed by Alfred Hitchcock
* ''Seventeen'' (1940), a second adaptation of the Tarkington novel
* ''Number 17'' (1949), a Swedish film
* ''Stalag 17'' (1953), directed by Billy Wilder
* ''Try Seventeen'' (2002), directed by Jeffrey Porter
* '' 17 Again'' (2009), directed by Burr Steers

===Anime and manga===
* Android 17, a character from the ''Dragon Ball'' series
* Detective Konawaka from the ''Paprika'' anime has a strong dislike for the number 17

===Games===
* The computer game ''[[Software:Half-Life 2|Half-Life 2]]'' takes place in and around City 17
* The visual novel ''[[Software:Ever 17: The Out of Infinity|Ever 17]]'' strongly revolves around the number 17

===Print===
* The title of ''Seventeen'', a magazine
* The title of ''Just Seventeen'', a former magazine
* The number 17 is a recurring theme in the works of novelist Steven Brust. All of his chaptered novels have either 17 chapters or two books of 17 chapters each. Multiples of 17 frequently appear in his novels set in the fantasy world of Dragaera, where the number is considered holy.
* In ''[[Religion:The Illuminatus! Trilogy|The Illuminatus! Trilogy]]'', the symbol for Discordianism includes a pyramid with 17 steps because 17 has "virtually no interesting geometric, arithmetic, or mystical qualities". However, for the [[Unsolved:Illuminati|Illuminati]], 17 is tied with the "23/17 phenomenon".
* In the Harry Potter universe
** 17 is the coming of age for wizards. It is equivalent to the usual coming of age at 18.
** 17 is the number of Sickles in one Galleon in the British wizards' currency.

===Religion===
* According to [[Philosophy:Plutarch|Plutarch]]'s [[Social:Moralia|Moralia]], the Egyptians have a legend that the end of Osiris' life came on the seventeenth of a month, on which day it is quite evident to the eye that the period of the full moon is over. Now, because of this, the Pythagoreans call this day "the Barrier", and utterly abominate this number. For the number seventeen, coming in between the square sixteen and the oblong rectangle eighteen, which, as it happens, are the only plane figures that have their perimeters equal their areas, bars them off from each other and disjoins them, and breaks up the epogdoon by its division into unequal intervals.<ref>{{cite book|url=https://penelope.uchicago.edu/Thayer/E/Roman/Texts/Plutarch/Moralia/Isis_and_Osiris*/C.html|author=Plutarch, Moralia|title=Isis and Osiris (Part 3 of 5)|publisher= Loeb Classical Library edition|date=1936}}</ref>
* In the [[Religion:Yasna|Yasna]] of [[Religion:Zoroastrianism|Zoroastrianism]], seventeen chapters were written by [[Biography:Zoroaster|Zoroaster]] himself. These are the [[Religion:Gathas|Gathas]].
* The number of the raka'ahs that Muslims perform during Salat on a daily basis.
* The number of surat al-Isra in the Qur'an.

==In sports==

* 17 is the number of the longest winning streak in NHL history, which the Pittsburgh Penguins achieved in 1993.
* Larry Ellison's victorious 2013 Americas Cup Oracle racing yacht bears the name "17".
* 17 is the number of the record for most NBA championships in NBA History, which the Boston Celtics (and as of 2020, the Los Angeles Lakers) achieved.
* 17 is the number of individual laws mentioned in the Laws of the Game (association football).
* 17 is the number of games played by each NFL team as of 2021.
* Since the start of the 2014 season, Formula One drivers have been able to choose their own car number; however, following the fatal accident of Jules Bianchi, who drove car #17, the number was retired.

==In other fields==
'''Seventeen''' is:
* Described at MIT as 'the least random number', according to the [[Jargon File]].<ref>{{cite web|url=http://www.catb.org/~esr/jargon/html/R/random-numbers.html|title=random numbers|website=catb.org/}}</ref> This is supposedly because in a study where respondents were asked to choose a random number from 1 to 20, 17 was the most common choice.
** This study has been repeated a number of times.<ref>{{cite web|url=http://blogs.discovermagazine.com/cosmicvariance/2007/01/30/the-power-of-17/|title=The Power of 17|work=Cosmic Variance|access-date=2010-06-14|archive-date=2008-12-04|archive-url=https://web.archive.org/web/20081204111153/http://blogs.discovermagazine.com/cosmicvariance/2007/01/30/the-power-of-17/|url-status=dead}}</ref>
* The number of guns in a 17-gun salute to U.S. Army, Air Force and Marine Corps Generals, and Navy and Coast Guard admirals.
* The maximum number of strokes of a Chinese radical.
* The total number of syllables in a haiku (5 + 7 + 5).
* In the [[Place:Nordic countries|Nordic countries]] the seventeenth day of the year is considered the ''heart'' and/or the ''back'' of winter. 
* "Highway 17" or "Route 17": See List of highways numbered 17 and List of public transport routes numbered 17.
* Seventeen, also known as Lock Seventeen, an unincorporated place in Clay Township, Tuscarawas County, Ohio.
* ''Seventeen'' was the former name of a yacht prior to being commissioned in the US Navy as the {{USS|Carnelian|PY-19}}.
[[Image:Alitalia-17.jpg|thumb|No row 17 in Alitalia planes]]
* In Italian culture, the number 17 is considered unlucky. When viewed as the Roman numeral, XVII, it is then changed anagrammatically to VIXI, which in the [[Social:Latin language|Latin language]] translates to "I lived", the perfect implying "My life is over." (c.f. "''Vixerunt''", [[Biography:Cicero|Cicero]]'s famous announcement of an execution.) [[Company:Renault|Renault]] sold its "R17" model in Italy as "R177". See Cesana Pariol in the sport section about the name of curve 17.
* The fear of the number 17 is called '[[Unsolved:Heptadecaphobia|heptadecaphobia]]' or 'heptakaidekaphobia'.
* Some species of [[Biology:Cicada|cicada]]s have a life cycle of 17 years (i.e. they are buried in the ground for 17 years between every mating season).
* The number to call police in France.
* Force 17, a special operations unit of the Palestinian Fatah movement.
* The number of the French department Charente-Maritime.
* Malaysia Airlines Flight 17 was shot down by Russian-controlled forces on 17 July 2014 after flying over eastern Ukraine. The first test flight of the plane, a Boeing 777-200ER, was on 17 July 1997, exactly 17 years prior to the doomed flight.

==References==
<references/>
* {{cite journal|author1=Berlekamp, E. R. |author2-link=Ronald L. Graham |author2=Graham, R. L. |title=Irregularities in the distributions of finite sequences

==External links==
* [http://www.vinc17.org/d17_eng.html Properties of 17]
* [http://www.yellowpigs.net/index.php?topic=yellowpigs/YP_seventeen Mathematical properties of 17] {{Webarchive|url=https://web.archive.org/web/20190729010229/https://www.yellowpigs.net/index.php?topic=yellowpigs%2FYP_seventeen |date=2019-07-29 }} at yellowpigs.net
* [https://web.archive.org/web/20100705142954/http://www.hilmar-alquiros.de/siebzehn.htm 17]
* [https://web.archive.org/web/20110818122755/http://scienceblogs.com/cognitivedaily/2007/02/is_17_the_most_random_number.php is 17 the most random number] at the wayback machine.
* [https://www.VirtueScience.com/17.html Number 17 at the Database of Number Correlations]
* [https://primes.utm.edu/curios/page.php/17.html Prime Curios for the number 17]


{{DEFAULTSORT:17 (Number)}}
[[Category:Integers]]

{{Sourceattribution|17 (number)}}