Properties of the Number 13156

Thirteen Thousand One Hundred Fifty-Six

Basics

Value: 13155 → 13156 → 13157

Parity: even

Prime: No

Previous Prime: 13151

Next Prime: 13159

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 2 ² × 11 × 13 × 23

Divisors: 1, 2, 4, 11, 13, 22, 23, 26, 44, 46

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11001101100100

Octal: 31544

Duodecimal: 7744

Hexadecimal: 3364

Square: 173080336

Square Root: 114.69960767151734

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

Numbers k such that k² divides 21^k-1. A128401

T(n,k)=Number of nXk 0..2 arrays with no element equal to any value at offset (-2,-1) (-2,1) or (-1,-1) and new values introduced in order 0..2. A275266

a(n) = (n-1)*(n+4)*(n+6)/6 for n > 1, a(1)=1. A137742

Number of unlabeled rooted trees with n vertices whose non-leaf terminal subtrees are all different. A324936

Smooth necklaces with 3 colors. A215327

a(n) = n*(n+1)*(7·n+2)/6. A255211

Total number of vertices in all loopless rooted planar maps with n edges. A27836

Array A(x,y) giving the position of the y-th·in A007001 listed by rising antidiagonals. A85180

Number of (w,x,y) with all terms in {0,...,n} and n/2 < w+x+y <= n. A212977

a(n) = (n-4)*(n+1)*(n+3)/6. A275874