Properties of the Number 155

One Hundred Fifty-Five

Basics

Value: 154 → 155 → 156

Parity: odd

Prime: No

Previous Prime: 151

Next Prime: 157

Digit Sum: 11

Digital Root: 2

Palindrome: No

Factorization: 5 × 31

Divisors: 1, 5, 31, 155

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011011

Octal: 233

Duodecimal: 10B

Hexadecimal: 9b

Square: 24025

Square Root: 12.449899597988733

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

Semiprimes (or biprimes): products of two primes. A1358

Squarefree semiprimes: Numbers that are the product of two distinct primes. A6881

Toothpick sequence (see Comments lines for definition). A139250

Generalized pentagonal numbers: m*(3·m - 1)/2, m = 0, +-1, +-2, +-3, .... A1318

Numbers congruent to 1 or 5 mod 6. A7310

Recamán's sequence (or Recaman's sequence): a(0) = 0; for n > 0, a(n) = a(n-1) - n if nonnegative and not already in the sequence, otherwise a(n) = a(n-1) + n. A5132

a(n) = 4·n + 3. A4767

a(n) = 3·n + 2. A16789

a(n) = n + (n+1)². A28387

Composite squarefree numbers. A120944

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