Properties of the Number 71931

Seventy-One Thousand Nine Hundred Thirty-One

Basics

Value: 71930 → 71931 → 71932

Parity: odd

Prime: No

Previous Prime: 71917

Next Prime: 71933

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 3 × 23977

Divisors: 1, 3, 23977, 71931

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10001100011111011

Octal: 214373

Duodecimal: 35763

Hexadecimal: 118fb

Square: 5174068761

Square Root: 268.19955257233374

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, q) = binomial(n, k) + qⁿ*binomial(n-2, k-1) - 1 with T(n, 0) = T(n, n) = 1 and q = 2, read by rows. A173046

Triangle read by rows: T(n,k) appears in the transformation ∑_k=0..n (k+1)*x^k = ∑_k=0..n T(n,k)*(x+2k)^k. A253381

Coefficients in the expansion of ([s] + [2s]x + [3s]x² + ...)/([r] + [2r]x + [3r]x² + ...); [ ] = floor, r = sqrt(3), s = sqrt(2). A279629

Semiprimes p·q such that p·q+p+q, p·q-(p+q), p·q+2*(p+q) and p·q-2*(p+q) are all primes. A356765

Non-Størmer numbers whose largest prime factor is a Størmer number. A71931