Properties of the Number 31287

Thirty-One Thousand Two Hundred Eighty-Seven

Basics

Value: 31286 → 31287 → 31288

Parity: odd

Prime: No

Previous Prime: 31277

Next Prime: 31307

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 3 × 10429

Divisors: 1, 3, 10429, 31287

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 111101000110111

Octal: 75067

Duodecimal: 16133

Hexadecimal: 7a37

Square: 978876369

Square Root: 176.8813161416434

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

G.f. A(x) satisfies A(x) = 1 / (1 - x·A(x) / (1+x))². A371494

Number of partitions of n such that m(2) > m(3), where m = multiplicity. A240065

Decimal part of a(n)^1/5 starts with a 'nine digits' anagram. A34280

Numbers whose base-5 representation contains exactly three 0's and three 2's. A45187

Position of n-th 0 in A007376. A31287

If a geodesic dome is made by dividing each triangle of an icosahedron into n² identical equilateral triangles and the vertices of those newly created triangles are pushed out from the center to lie on the surface of the sphere in which the icosahedron is inscribed, then this sequence gives the number of different strut lengths that are required to build the dome. A97108