Properties of the Number 80904

Eighty Thousand Nine Hundred Four

Basics

Value: 80903 → 80904 → 80905

Parity: even

Prime: No

Previous Prime: 80897

Next Prime: 80909

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 2 ³ × 3 × 3371

Divisors: 1, 2, 3, 4, 6, 8, 12, 24, 3371, 6742

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 10011110000001000

Octal: 236010

Duodecimal: 3A9A0

Hexadecimal: 13c08

Square: 6545457216

Square Root: 284.4362846051818

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

Solutions a(n) of (a(n)-5)*(a(n)-6) = 21·b(n)*(b(n)-1). A180509

T(n,k)=Number of nXk binary arrays with top left value 1 and no two ones adjacent horizontally, vertically or antidiagonally. A228482

Triangle T, read by rows, where T(n,k) = ∑_j=1..n-k-1 [T^j](n-1,k) with T(n+1,n) = 2·n+1 and T(n,n)=0 for n>=0, where T^j denotes the j-th matrix power of T. A243920

a(1)=1; for n>1, a(n)=a(n-1)-4 if n is already in the sequence, a(n)=a(n-1)+5 otherwise. A80904

Number of nX7 binary arrays with top left value 1 and no two ones adjacent horizontally, vertically or nw-se diagonally. A228282

Number of nX7 binary arrays with top left value 1 and no two ones adjacent horizontally, vertically or antidiagonally. A228481

Number of nX7 0..2 arrays with no element x(i,j) adjacent to value 2-x(i,j) horizontally, vertically or antidiagonally. A232940