183 (number)

Short description: Natural number

| <- 182  | 183 |  184 ->

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← 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.[1]

Because 183=132+13+1, it is the number of points in a projective plane over the finite field ℤ13.[2] 183 is the fourth element of a divisibility sequence 1,3,13,183,… in which the nth number an can be computed as an=an−12+an−1+1=⌊x2n⌋, for a transcendental number x≈1.38509.[3][4] This sequence counts the number of trees of height ≤n in which each node can have at most two children.[3][5]

There are 183 different semiorders on four labeled elements.[6]

## See also

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

## References

1. ↑ Sloane, N. J. A., ed. "Sequence A082897 (Perfect totient numbers)". OEIS Foundation. https://oeis.org/A082897.
2. ↑ Sloane, N. J. A., ed. "Sequence A002061 (Central polygonal numbers)". OEIS Foundation. https://oeis.org/A002061.
3. ↑ 3.0 3.1 Sloane, N. J. A., ed. "Sequence A002065". OEIS Foundation. https://oeis.org/A002065.
4. ↑ Dubickas, Artūras (2022). "Transcendency of some constants related to integer sequences of polynomial iterations". Ramanujan Journal 57 (2): 569–581. doi:10.1007/s11139-021-00428-5.
5. ↑ Kalman, Stan C.; Kwasny, Barry L. (January 1995). "Tail-recursive distributed representations and simple recurrent networks". Connection Science 7 (1): 61–80. doi:10.1080/09540099508915657. https://openscholarship.wustl.edu/cse_research/547.
6. ↑ Sloane, N. J. A., ed. "Sequence A006531 (Semiorders on n elements)". OEIS Foundation. https://oeis.org/A006531.

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