Properties of the Number -679

Six Hundred Seventy-Nine

Basics

Value: -680 → -679 → -678

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 7 × 97

Divisors: 1, 7, 97, 679

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -1010100111

Octal: -1247

Duodecimal: -487

Hexadecimal: -2a7

Square: 461041

Square Root: 26.057628441590765

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

Expansion of 1/(1-x-x²+2·x³). A77948

Expansion of g.f. A(x) = ∑_n=-oo..+oo xⁿ * (i + xⁿ)^2·n, where i² = -1. A363569

Coefficients in the expansion of B⁷/C, in Watson's notation of page 118. A160534

a(n) = ∑_k=0..n A105595(k)*(-1)^k*A105595(n-k) (interpolated zeros suppressed). A105596

Expansion of χ(x³) / χ(x) in powers of·where χ() is a Ramanujan θ function. A227398

Partition function coefficients for square lattice spin 2 Ising model. A10108

a(0)=a(1)=1, a(n) = 2·a(n-1)- A010686(n), n>1. A173114

Triangle T(n,k) = A015440(k) - A015440(n) + A015440(n-k), read by rows. A176263

a(n) = ∑_d∣n (-1)^n/d-1 * binomial(d+n/d-1, d). A344777

E.g.f. satisfies A(x) = exp( x·exp(x) / A(x)³ ). A362672