Properties of the Number 18813

Eighteen Thousand Eight Hundred Thirteen

Basics

Value: 18812 → 18813 → 18814

Parity: odd

Prime: No

Previous Prime: 18803

Next Prime: 18839

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 3 × 6271

Divisors: 1, 3, 6271, 18813

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100100101111101

Octal: 44575

Duodecimal: AA79

Hexadecimal: 497d

Square: 353928969

Square Root: 137.16048993788263

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

Define the sequence T(a(0),a(1)) by a(n+2) is the greatest integer such that a(n+2)/a(n+1) < a(n+1)/a(n) for n >= 0. This is T(5,26). A22032

a(n) = n⁷ + 7·n + 7ⁿ. A220528

Numbers m such that A166133(m+1) = A166133(m)² - 1. A256703

Numbers n for which the numbers 6n+1, 3n+2, 6n+7 are all odd composite squarefree numbers, but none are semiprimes. A263510

Number of kites, distinct up to congruence, on an n X n grid (or geoboard). A181946

Numbers k such that 171·2^k+1 is prime. A32462

Discriminants of real quadratic fields with class number 1 and related continued fraction period length of 18. A50967

Number of lines through exactly 6 points of an n X n grid of points. A18813

Main diagonal T(n,n) of array T(k,n) = n-th value of m^prime(k) + m·prime(k) + prime(k)^m. A182127