Properties of the Number 42505

Forty-Two Thousand Five Hundred Five

Basics

Value: 42504 → 42505 → 42506

Parity: odd

Prime: No

Previous Prime: 42499

Next Prime: 42509

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 5 × 8501

Divisors: 1, 5, 8501, 42505

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1010011000001001

Octal: 123011

Duodecimal: 20721

Hexadecimal: a609

Square: 1806675025

Square Root: 206.1674077054858

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

a(n) = 2·a(n-1) + 2·a(n-2) + 2·a(n-3) - a(n-4); a(0)=0, a(1)=1, a(2)=3, a(3)=9, a(4)=25. A138574

E.g.f. A(x) satisfies A(x) = 1 + A(x)⁵ * Integral 1/A(x)⁵ dx. A234295

a(n) = binomial(n + 4, n - 1) + 1. A323228

Denominators of continued fraction convergents to sqrt(780). A42505