Properties of the Number 15509

Fifteen Thousand Five Hundred Nine

Basics

Value: 15508 → 15509 → 15510

Parity: odd

Prime: No

Previous Prime: 15497

Next Prime: 15511

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 13 × 1193

Divisors: 1, 13, 1193, 15509

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

603 Try Today's Challenge

Representations

Binary: 11110010010101

Octal: 36225

Duodecimal: 8B85

Hexadecimal: 3c95

Square: 240529081

Square Root: 124.53513560437472

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

Length of row n of A143589 (a Kolakoski fan). A143590

Self-convolution of sequence A001402. A160647

a(n) = 75*(2ⁿ - 1) - 4·n³ - 18·n² - 52·n. A257449

Recurrence a(1) = 1, a(2) = 5; a(n) = (a(n-1) + a(n-2))/GCD(a(n-1),a(n-2)) + 1. A349576

A triangular array distributing the values of sequence A120380. A160645

Number of nX7 0..2 arrays with no element equal to one plus the sum of elements to its left or one plus the sum of elements above it or one plus the sum of the elements diagonally to its northwest, modulo 3. A239360

Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 253", based on the 5-celled von Neumann neighborhood. A271052

Number of n X n binary arrays symmetric under 90-degree rotation with all ones connected only in two by two blocks. A145863

Numbers n such that 15·prime(n)+{-4,-2,2,4} are all primes. A176002

a(1) = 1, a(n) = ∑_k=1..n-1 ((8^k - 1)/7)*a(k). A15509