Properties of the Number 68818

Sixty-Eight Thousand Eight Hundred Eighteen

Basics

Value: 68817 → 68818 → 68819

Parity: even

Prime: No

Previous Prime: 68813

Next Prime: 68819

Digit Sum: 31

Digital Root: 4

Palindrome: No

Factorization: 2 × 19 × 1811

Divisors: 1, 2, 19, 38, 1811, 3622, 34409, 68818

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10000110011010010

Octal: 206322

Duodecimal: 339AA

Hexadecimal: 10cd2

Square: 4735917124

Square Root: 262.3318509064425

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

Constant term of the reduction by x²->x+1 of the polynomial p(n,x) defined at Comments. A193008

Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 3,1 4,2 polyhexes in any orientation on a planar nXnXn triangular grid. A155246

G.f. A(x) satisfies: A(x)² = A( x² + 2·A(x)³ ), with A(0)=0, A'(0)=1. A271959

Triangle read by rows, T(n, k) = binomial(3*(prime(n+1) - 1)/2, 3*(prime(k+1) - 1)/2) with T(n,0) = 1. A154652

a(n) = smallest triangular number having no digit in common with the previous term, with a(1) = 1. A68818