Properties of the Number 18557

Eighteen Thousand Five Hundred Fifty-Seven

Basics

Value: 18556 → 18557 → 18558

Parity: odd

Prime: No

Previous Prime: 18553

Next Prime: 18583

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 7 × 11 × 241

Divisors: 1, 7, 11, 77, 241, 1687, 2651, 18557

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100100001111101

Octal: 44175

Duodecimal: A8A5

Hexadecimal: 487d

Square: 344362249

Square Root: 136.2240801033356

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

a(n) = 7·a(n-1) + a(n-2), starting with a(0) = 2 and a(1) = 7. A86902

Expansion of ∑_k>=1 x^k / (1 - k·x^k)^k. A324158

Numerators of continued fraction convergents to sqrt(53). A41090

a(n) = n*(n+1)*(11·n +10)/6. A254407

Square array A read by antidiagonals: the columns are given by A(n,1)=1, A(n,2)=n+1, A(n,3) = n²+2n+3, A(n,4) = n³+3·n²+6·n+4, A(n,5) = n⁴+4·n³+10·n²+12·n+7, ..., whose coefficients are given by A104509 (see also A118981). A309220

Number of ordered sextuples of distinct pairwise coprime positive integers with largest element n. A186977

a(n) = n⁵ + 5·n³ + 5·n. A261391

Numbers n for which there are exactly ten k such that n = k + reverse(k). A72434

Consecutive exclusionary squares: Numbers n such that n² does not contain digits of n and (n+1)² does not contain digits of n+1. A247843

Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 605", based on the 5-celled von Neumann neighborhood. A273177