Properties of the Number -2015

Fifteen

Basics

Value: -2016 → -2015 → -2014

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 8

Digital Root: 8

Palindrome: No

Factorization: 5 × 13 × 31

Divisors: 1, 5, 13, 31, 65, 155, 403, 2015

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -11111011111

Octal: -3737

Duodecimal: -11BB

Hexadecimal: -7df

Square: 4060225

Square Root: 44.88875137492688

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(n,k), n>=1, 0<=k<=n², read by rows: row n gives the coefficients of the chromatic polynomial of the square grid graph G_n,n, highest powers first. A182368

Expansion of 1/sqrt(1 - 2x + 13x²). A98333

Square array A(n,k), n >= 0, k >= 0, read by antidiagonals, where column k is the expansion of 1/sqrt(1 - 2·x + (1+4·k)*x²). A307860

Triangle, read by rows, where the n-th row lists the (2·n+1) coefficients of (1 + x - 3·x²)ⁿ. A84614

Row sums of number triangle related to the Jacobsthal numbers. A110325

First term of n-th difference sequence of (floor(k·r)), r = sqrt(5), k >= 0. A325668

First differences of A067046. A291681

Number of partitions of n into distinct and relatively prime parts. A78374

a(n) = n*(2·n + 3). A14106

Number of sublattices of index n in generic 3-dimensional lattice. A1001