Properties of the Number 31148

Thirty-One Thousand One Hundred Forty-Eight

Basics

Value: 31147 → 31148 → 31149

Parity: even

Prime: No

Previous Prime: 31147

Next Prime: 31151

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 2 ² × 13 × 599

Divisors: 1, 2, 4, 13, 26, 52, 599, 1198, 2396, 7787

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 111100110101100

Octal: 74654

Duodecimal: 16038

Hexadecimal: 79ac

Square: 970197904

Square Root: 176.48795992928243

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

Triangle T, read by rows, that satisfies: T(n,k) = [T²](n-1,k) for n>k+1>=1, with T(n,n) = 1 and T(n+1,n) = n+1 for n>=0, where T² is the matrix square of T. A109152

Numbers k that divide the alternating sum σ(1) - σ(2) + σ(3) - σ(4) + ... + ((-1)^k+1)*σ(k). A67931

A doubly-fractal sequence. Erase the first (leftmost) digit of every integer: what is left is the sequence itself. The erased digits, one by one, form also the sequence itself. A127274

Number of refinement sequences n -> ... -> {1}ⁿ, where in each step every single part of a nonempty selection of parts is replaced by a partition of itself into smaller parts (in weakly decreasing order). A327697

a(n) = index in A377912 (or, equally, in A342042) of the first n-digit term. A377918

a(n) = prime(n)*prime(n+1) + prime(n+2). A292926

G.f. satisfies: 2·A(x) = 3·x + x² - Series_Reversion( A(x) ). A139085

When a digit d in the digit-stream of this sequence is even, the next digit is > d. A342042

Number of series-reduced planted trees with n leaves of 2 colors and no symmetries. A31148