Properties of the Number 255

Two Hundred Fifty-Five

Basics

Value: 254 → 255 → 256

Parity: odd

Prime: No

Previous Prime: 251

Next Prime: 257

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 3 × 5 × 17

Divisors: 1, 3, 5, 15, 17, 51, 85, 255

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 11111111

Octal: 377

Duodecimal: 193

Hexadecimal: ff

Square: 65025

Square Root: 15.968719422671311

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Expansion of ∏_k>=0 (1 + x^2k+1); number of partitions of n into distinct odd parts; number of self-conjugate partitions; number of symmetric Ferrers graphs with n nodes. A700

a(n) = 2ⁿ - 1. (Sometimes called Mersenne numbers, although that name is usually reserved for A001348.) A225

Triangle of Stirling numbers of the second kind, S2(n,k), n >= 1, 1 <= k <= n. A8277

Numbers k such that (266·10^k + 1)/3 is prime. A269303

a(n) = n*(n+2) = (n+1)² - 1. A5563

Triangle of Stirling numbers of 2nd kind, S(n,k), n >= 0, 0 <= k <= n. A48993

Numbers whose base-3 representation contains no 2. A5836

Binary palindromes: numbers whose binary expansion is palindromic. A6995

Sphenic numbers: products of 3 distinct primes. A7304

Numbers of the form 2^n-1*(2^n·m-1)/(2ⁿ-1), n >= 1, m >= 1. A272919

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