Properties of the Number 265

Two Hundred Sixty-Five

Basics

Value: 264 → 265 → 266

Parity: odd

Prime: No

Previous Prime: 263

Next Prime: 269

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 5 × 53

Divisors: 1, 5, 53, 265

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100001001

Octal: 411

Duodecimal: 1A1

Hexadecimal: 109

Square: 70225

Square Root: 16.278820596099706

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

Subfactorial or rencontres numbers, or derangements: number of permutations of n elements with no fixed points. A166

Centered square numbers: a(n) = 2·n*(n+1)+1. Sums of two consecutive squares. Also, consider all Pythagorean triples (X, Y, Z=Y+1) ordered by increasing Z; then sequence gives Z values. A1844

Padovan sequence (or Padovan numbers): a(n) = a(n-2) + a(n-3) with a(0) = 1, a(1) = a(2) = 0. A931

a(n) = 6·n + 1. A16921

Odd semiprimes: odd numbers divisible by exactly 2 primes (counted with multiplicity). A46315

Triangle T(n,k) of rencontres numbers (number of permutations of n elements with k fixed points). A8290

Multiples of 5: a(n) = 5·n. A8587

a(n) = ceiling(n²/2). A982

Ordered hypotenuses (with multiplicity) of primitive Pythagorean triangles. A20882

Number of ordered triples (w,x,y) with all terms in {-n,...,0,...,n} and w² + x·y = 0. A211422