183 (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	ΡろーΠぱいΓがんま´
Roman numeral	CLXXXIII
Binary	101101112
Ternary	202103
Senary	5036
Octal	2678
Duodecimal	13312
Hexadecimal	B716

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 $\mathbb {Z} _{13}$. 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

$$a_{n}=a_{n-1}^{2}+a_{n-1}+1={\bigl \lfloor }x^{2^{n}}{\bigr \rfloor },$$

for a transcendental number $x\approx 1.38509$. This sequence counts the number of trees of height $\leq n$ 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