Properties of the Number -205

Two Hundred Five

Basics

Value: -206 → -205 → -204

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 7

Digital Root: 7

Palindrome: No

Factorization: 5 × 41

Divisors: 1, 5, 41, 205

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -11001101

Octal: -315

Duodecimal: -151

Hexadecimal: -cd

Square: 42025

Square Root: 14.317821063276353

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

Coefficients of (q*(j(q)-1728))^5/24 where j(q) is the elliptic modular invariant. A289333

Expansion of 1/(1 - x*∏_k>=1 1/(1 + x^k)). A299208

Determinant of n X n matrix of first n² terms of Kolakoski sequence (A000002). A119493

For 1<=x<=n, 1<=y<=n, write gcd(x,y) = u·x+v·y with u,v minimal; a(n) = sum of the values of u+v. A345428

G.f.: ∑_n=-oo..+oo x^n² / (1 - xⁿ)ⁿ. A261605

Expansion of 1/(1-x+2·x³). A77950

A transform of the Fibonacci numbers. A99505

Expansion of q^-3/8* η(q)⁷* η(q⁴)²/ η(q²)³ in powers of q. A128713

a(n) = Im((1-I)^1-n*A_{n, 3}(I)) where A_{n, k}(x) are the generalized Eulerian polynomials. A225147

Numerators of a BBP-like formula for 4*π/sqrt(27). A260658