253 (number)

Short description: Natural number

| <- 252  | 253 |  254 ->

|
|

← 250 251 252 253 254 255 256 257 258 259 →

List of numbers — Integers

← 0 100 200 300 400 500 600 700 800 900 →

Cardinal| two hundred fifty-three
Ordinal| 253rd
(two hundred fifty-third)
Factorization| 11 × 23
Divisors| 1, 11, 23, 253
Greek numeral| ΣΝΓ´
Roman numeral| CCLIII
Binary| 111111012
Ternary| 1001013
Quaternary| 33314
Quinary| 20035
Senary| 11016
Octal| 3758
Duodecimal| 19112
Hexadecimal| FD16
Vigesimal| CD20
Base 36| 7136

253 (two hundred [and] fifty-three) is the natural number following 252 and preceding 254.

## In mathematics

253 is:

* a semiprime since it is the product of 2 primes.
* a triangular number.[1]
* a star number.[2]
* a centered heptagonal number.[3]
* a centered nonagonal number.[4]
* a Blum integer.[5]
* a member of the 13-aliquot tree.

10506−10253−1 is a prime number.

## References

1. ↑ Sloane, N. J. A., ed. "Sequence A000217 (triangular numbers)". OEIS Foundation. https://oeis.org/A000217.
2. ↑ Sloane, N. J. A., ed. "Sequence A003154 (Centered 12-gonal numbers. Also star numbers: 6*n*(n-1) + 1)". OEIS Foundation. https://oeis.org/A003154.
3. ↑ Sloane, N. J. A., ed. "Sequence A069099 (Centered heptagonal numbers. a(n) = (7*n^2 - 7*n + 2)/2)". OEIS Foundation. https://oeis.org/A069099.
4. ↑ Sloane, N. J. A., ed. "Sequence A060544 (Centered 9-gonal numbers. (3n-1)*(3n-2)/2)". OEIS Foundation. https://oeis.org/A060544.
5. ↑ Sloane, N. J. A., ed. "Sequence A016105 (Blum integers: numbers of the form p * q where p and q are distinct primes congruent to 3 (mod 4))". OEIS Foundation. https://oeis.org/A016105.

0.00

(0 votes)

Original source: https://en.wikipedia.org/wiki/253 (number). Read more

|

Retrieved from "https://handwiki.org/wiki/index.php?title=253_(number)&oldid=286170"