Properties of the Number 80939

Eighty Thousand Nine Hundred Thirty-Nine

Basics

Value: 80938 → 80939 → 80940

Parity: odd

Prime: No

Previous Prime: 80933

Next Prime: 80953

Digit Sum: 29

Digital Root: 2

Palindrome: No

Factorization: 29 × 2791

Divisors: 1, 29, 2791, 80939

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011110000101011

Octal: 236053

Duodecimal: 3AA0B

Hexadecimal: 13c2b

Square: 6551121721

Square Root: 284.49780315496287

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

Number of obtuse triangles, distinct up to congruence, on an n X n grid (or geoboard). A190022

a(n) = numerator of ∑_i=1..n 1/A171397(i). A375523

Denominators of continued fraction convergents to sqrt(818). A42579

n·10⁵-1, n·10⁵-3, n·10⁵-7 and n·10⁵-9 are all prime. A64979

a(n) = denominator of ∑_i=1..n 1/A171397(i). A375524

a(1)=3; for n>1, a(n)=a(n-1)-2 if n is already in the sequence, a(n)=a(n-1)+5 otherwise. A80939

a(n) equals the coefficient of x^2n-1 in the (2n-1)-th iteration of x/(1-x²) for n>=1. A185752