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Properties of the Number 18903

Eighteen Thousand Nine Hundred Three

Basics

Value: 18902 → 18903 → 18904

Parity: odd

Prime: No

Previous Prime: 18899

Next Prime: 18911

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 3 × 6301

Divisors: 1, 3, 6301, 18903

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100100111010111

Octal: 44727

Duodecimal: AB33

Hexadecimal: 49d7

Square: 357323409

Square Root: 137.48818131024936

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

T(n,k) is the number of lower triangles of an n X n integer array with each element differing from all of its diagonal, vertical, antidiagonal and horizontal neighbors by k or less and triangles differing by a constant counted only once. A195220
Numbers n such that (n+j) mod (2+j) = 1 for j from 0 to 5 and (n+6) mod 8 <> 1. A96024
Number of secondary structures of size n having no stacks of even length. A202849
Triangle read by rows: T(n,k) is the number of secondary structures of size n having k stacks of even length (n>=0, k>=0). A202848
Values of A038005 ending in 3. A38013
G.f.: ∑n>=0 xn * (1+x)A003188(n), where A003188(n) = n XOR [n/2] is the Gray code for n. A227526
Numbers k such that φ(k) is equal to A008473(k+1). A39781
Number of lower triangles of a 3 X 3 integer array with each element differing from all of its diagonal, vertical, antidiagonal and horizontal neighbors by n or less and triangles differing by a constant counted only once. A195221
Quadruples of different integers from [ 2,n ] with no common factors between triples. A15629
Number of lower triangles of an n X n integer array with each element differing from all of its diagonal, vertical, antidiagonal and horizontal neighbors by 4 or less and triangles differing by a constant counted only once. A195216