183 (number)

Short description: Natural number

← 182 183 184 →
← 180 181 182 183 184 185 186 187 188 189 → List of numbers — Integers ← 0 100 200 300 400 500 600 700 800 900 →
Cardinal	one hundred eighty-three
Ordinal	183rd (one hundred eighty-third)
Factorization	3 × 61
Divisors	1, 3, 61, 183
Greek numeral	ΡΠΓ´
Roman numeral	CLXXXIII
Binary	101101112
Ternary	202103
Quaternary	23134
Quinary	12135
Senary	5036
Octal	2678
Duodecimal	13312
Hexadecimal	B716
Vigesimal	9320
Base 36	5336

183 (one hundred [and] eighty-three) is the natural number following 182 and preceding 184.

In mathematics

183 is a perfect totient number, a number that is equal to the sum of its iterated totients.

Because $183=13^2+13+1$, it is the number of points in a projective plane over the finite field ${\mathbb{\mathbb{Z}}}_{13}$. 183 is the fourth element of a divisibility sequence $1,3,13,183,\dots$ in which the $n$th number $a_n$ can be computed as $$a_n=a_{n-1}^2+a_{n-1}+1=\lfloor x^{2^n}\rfloor ,$$ for a transcendental number $x\approx 1.38509$. This sequence counts the number of trees of height $\le n$ in which each node can have at most two children.

There are 183 different semiorders on four labeled elements.

See also

• The year AD 183 or 183 BC
• List of highways numbered 183
• All pages with titles containing 183