Properties of the Number -815

Eight Hundred Fifteen

Basics

Value: -816 → -815 → -814

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 5 × 163

Divisors: 1, 5, 163, 815

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -1100101111

Octal: -1457

Duodecimal: -57B

Hexadecimal: -32f

Square: 664225

Square Root: 28.548204847240395

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 in pairs (j,k), with j <> k +- 1, such that the sum of their cubes is equal to a centered cube number. A352136

Expansion of f(-x²)² * f(x, x²) / f(-x³)³ in powers of·where f(,) is a Ramanujan θ function. A132179

Expansion of 3·q^1/3 * φ(q) * ψ(q⁶) / c(q) in powers of·where φ(), ψ() are Ramanujan θ functions and c() is a cubic AGM θ function. A233037

Coefficient of X³ in the characteristic polynomial of the n-th power of the matrix M = {{1,1,1,1,1}, {1,0,0,0,0}, {0,1,0,0,0}, {0,0,1,0,0}, {0,0,0,1,0}}. A123127

Expansion of (1-2x-5x²-7x³+x⁶)/((1-x)(1-x³)²). A141352

G.f. A(x) satisfies: A(x)⁶ = (1-x) * (A(x) + x)⁵. A352415

Expansion of (1-x)^-1/(1-x²+x³). A77883

Expansion of x*(1+2·x+3·x²+4·x³+4·x⁴)/(1+x+x²+x³-x⁵). A122520

Riordan array (1/(1-x-x²), x/(1+2·x)). A237498

First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 161", based on the 5-celled von Neumann neighborhood. A270453