253 (number)
| ||||
|---|---|---|---|---|
| Cardinal | two hundred fifty-three | |||
| Ordinal |
253rd (two hundred and fifty-third) | |||
| Factorization | 11 × 23 | |||
| Divisors | 1, 11, 23, 253 | |||
| 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.
References
- ↑ "Sloane's A000217 : triangular numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ↑ "Sloane's A003154 : Centered 12-gonal numbers. Also star numbers: 6*n*(n-1) + 1". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ↑ "Sloane's A069099 : Centered heptagonal numbers. a(n) = (7*n^2 - 7*n + 2)/2". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ↑ "Sloane's A060544 : Centered 9-gonal numbers. (3n-1)*(3n-2)/2". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ↑ "Sloane's A016105 : Blum integers: numbers of the form p * q where p and q are distinct primes congruent to 3 (mod 4)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
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