View source for 30,000

{{Infobox number
| number = 30000
}}
'''30,000''' ('''thirty thousand''') is the [[Natural number|natural number]] that comes after 29,999 and before 30,001.

==Selected numbers in the range 30001–39999==

===30001 to 30999===
* '''30029''' = [[Primorial prime|primorial prime]]
* '''30030''' = [[Primorial|primorial]]<ref>{{Cite web|url=https://oeis.org/A002110|title=Sloane's A002110 : Primorial numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-15}}</ref>
* '''30031''' = smallest [[Composite number|composite number]] which is one more than a primorial
* '''30203''' = [[Safe prime|safe prime]]
* '''30240''' = [[Harmonic divisor number|harmonic divisor number]]<ref name=":0">{{Cite web|url=https://oeis.org/A001599|title=Sloane's A001599 : Harmonic or Ore numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-15}}</ref>
* '''30323''' = Sophie Germain prime and safe prime
* '''30420''' = pentagonal pyramidal number<ref name=":1">{{Cite web|url=https://oeis.org/A002411|title=Sloane's A002411 : Pentagonal pyramidal numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-15}}</ref>
* '''30537''' = Riordan number
* '''30694''' = open meandric number
* '''30941''' = first base 13 repunit prime

===31000 to 31999===
* '''31116''' = octahedral number<ref name=":2">{{Cite web|url=https://oeis.org/A005900|title=Sloane's A005900 : Octahedral numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-15}}</ref>
* '''31337''' = [[Cousin prime|cousin prime]], pronounced ''elite'', an alternate way to spell ''[[Leet|1337]]'', an obfuscated alphabet made with numbers and punctuation, known and used in the [[Software:Gamer|gamer]], hacker, and [[Bulletin board system|BBS]] cultures.
* '''31395''' = square pyramidal number
* '''31397''' = prime number followed by a record [[Prime gap|prime gap]] of 72, the first greater than 52<ref>{{MathWorld|title=Prime Gaps|urlname=PrimeGaps}}</ref>
* '''31688''' = the number of years approximately equal to 1 trillion seconds
* '''31721''' = start of a [[Prime quadruplet|prime quadruplet]]<ref name="quadruplet">{{Cite OEIS|sequencenumber=A007530}}</ref>
* '''31929''' = [[Zeisel number]]<ref>{{Cite web|url=https://oeis.org/A051015|title=Sloane's A051015 : Zeisel numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-15}}</ref>

===32000 to 32999===
* '''32043''' = smallest number whose [[Square (algebra)|square]] is [[Pandigital number|pandigital]].
* '''32045''' = can be expressed as a sum of two squares in more ways than any smaller number.<ref>{{Cite OEIS|sequencenumber=A088959}}</ref>
* '''32760''' = harmonic divisor number<ref name=":0" />
* '''32761''' = 181<sup>2</sup>, [[Centered hexagonal number|centered hexagonal number]]
* '''32767''' = 2<sup>15</sup> &minus; 1, largest positive value for a signed ([[Two's complement|two's complement]]) 16-bit [[Integer (computer science)|integer on a computer]].
* '''32768''' = 2<sup>15</sup> = 8<sup>5</sup>, maximum [[Absolute value|absolute value]] of a negative value for a signed (two's complement) 16-bit [[Integer (computer science)|integer on a computer]].
* '''32800''' = pentagonal pyramidal number<ref name=":1" />
* '''32993''' = [[Leyland number]]<ref>{{Cite web|url=https://oeis.org/A076980|title=Sloane's A076980 : Leyland numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-15}}</ref>

===33000 to 33999===
* '''33333''' = [[Repdigit|repdigit]]
* '''33461''' = Pell number,<ref>{{Cite web|url=https://oeis.org/A000129|title=Sloane's A000129 : Pell numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-15}}</ref> Markov number<ref name=":3">{{Cite web|url=https://oeis.org/A002559|title=Sloane's A002559 : Markoff (or Markov) numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-15}}</ref>
* '''33511''' = square pyramidal number
* '''33781''' = octahedral number<ref name=":2" />

===34000 to 34999===
* '''34560''' = 5 [[Superfactorial|superfactorial]]<ref>{{Cite web|url=https://oeis.org/A000178|title=Sloane's A000178 : Superfactorials|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-15}}</ref>
* '''34790''' = number of non-isomorphic set-systems of weight 13.
* '''34841''' = start of a prime quadruplet<ref name="quadruplet" />
* '''34969''' = favorite number of the Muppet character Count von Count<ref>{{cite web|url=https://www.bbc.co.uk/news/magazine-19409960|title=Why was 34,969 Count von Count's magic number?|date=2012-08-30|access-date=2012-08-31|work=BBC News}}</ref>

===35000 to 35999===
* '''35720''' = square pyramidal number
* '''35840''' = number of [[Ounce|ounce]]s in a [[Long ton|long ton]] (2,240 [[Pound (mass)|pounds]])
* '''35890''' = tribonacci number<ref>{{Cite web|url=https://oeis.org/A000073|title=Sloane's A000073 : Tribonacci numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-15}}</ref>
* '''35899''' = [[Alternating factorial|alternating factorial]]<ref>{{Cite web|url=https://oeis.org/A005165|title=Sloane's A005165 : Alternating factorials|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-15}}</ref>
* '''35937''' = 33<sup>3</sup>, chiliagonal number<ref>{{Cite web|url=https://oeis.org/A195163|title=Sloane's A195163 : 1000-gonal numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-15}}</ref>
* '''35964''' = [[Digit-reassembly number|digit-reassembly number]]

===36000 to 36999===
* '''36100''' = sum of the cubes of the first 19 positive integers
* '''36463''' – number of parallelogram polyominoes with 14 cells<ref>{{cite OEIS|A006958|Number of parallelogram polyominoes with n cells (also called staircase polyominoes, although that term is overused)}}</ref>
* '''36594''' = octahedral number<ref name=":2" />

===37000 to 37999===
* '''37378''' = semi-meandric number<ref>{{Cite web|url=https://oeis.org/A000682|title=Sloane's A000682 : Semimeanders|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-15}}</ref>
* '''37634''' = third term of the Lucas–Lehmer sequence
* '''37666''' = [[Markov number]]<ref name=":3" />
* '''37926''' = pentagonal pyramidal number<ref name=":1" />

===38000 to 38999===
* '''38024''' = square pyramidal number
* '''38209''' = n such that n | (3<sup>n</sup> + 5)<ref>{{cite OEIS|A277288|Positive integers n such that n | (3^n + 5)}}</ref>
* '''38416''' = 14<sup>4</sup>
* '''38807''' = number of non-equivalent ways of expressing 10,000,000 as the sum of two prime numbers<ref>{{Cite OEIS|1=A065577|2=Number of Goldbach partitions of 10^n|access-date=2023-08-31}}</ref>
* '''38962''' = [[Kaprekar number]]<ref>{{Cite web|url=https://oeis.org/A006886|title=Sloane's A006886 : Kaprekar numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-15}}</ref>

===39000 to 39999===
* '''39304''' = 34<sup>3</sup>
* '''39559''' = octahedral number<ref name=":2" />
* '''39648''' = tetranacci number<ref>{{Cite web|url=https://oeis.org/A000078|title=Sloane's A000078 : Tetranacci numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-15}}</ref>

===Primes===
There are 958 prime numbers between 30000 and 40000.

== References ==
{{reflist}}


[[Category:Integers|30000]]

{{Sourceattribution|30,000}}