Properties of the Number -239

Two Hundred Thirty-Nine

Basics

Value: -240 → -239 → -238

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 239

Divisors: 1, 239

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: -11101111

Octal: -357

Duodecimal: -17B

Hexadecimal: -ef

Square: 57121

Square Root: 15.459624833740307

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, such that the m-th matrix power satisfies T^m = I + m*(T - I) and consequently the matrix logarithm satisfies log(T) = T - I, where I is the identity matrix. A112555

Alternating sum σ(1)-σ(2)+σ(3)-σ(4)+...+((-1)ⁿ⁺¹)*σ(n). A68762

E.g.f. A(x) satisfies: [x^n-1] A(x)^n² = [xⁿ] A(x)^n² for n>=1. A296170

a(n) = -2·a(n-1) + a(n-2) for n>1, a(0)=1, a(1)=-1. A123335

Row sums of a number triangle related to the Pell numbers. A110331

Expansion of ψ(x) * φ(-x)³ / χ(-x³)³ in powers of·where φ(), ψ(), χ() are Ramanujan θ functions. A134077

Real part of (3 + 2i)ⁿ. A121622

Triangle of coefficients of Gaussian polynomials [2n+5,4]_q represented as finite sum of terms (1+q²)^k*q^g-k, where k = 0,1,...,g with g=4n+2. A267484

a(1) = 1; a(n) = -∑_k=2..n k² * a(floor(n/k)). A360390

Signed primes: if prime(n) even, a(n) = 0; if prime(n) == 1 (mod 4), a(n) = prime(n); if prime(n) == -1 (mod 4), a(n) = -prime(n). A73579