Properties of the Number 15218

Fifteen Thousand Two Hundred Eighteen

Basics

Value: 15217 → 15218 → 15219

Parity: even

Prime: No

Previous Prime: 15217

Next Prime: 15227

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 2 × 7 × 1087

Divisors: 1, 2, 7, 14, 1087, 2174, 7609, 15218

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11101101110010

Octal: 35562

Duodecimal: 8982

Hexadecimal: 3b72

Square: 231587524

Square Root: 123.36125809993995

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

Aliquot sequence starting at 180. A8891

Consider the Diophantine equation x³ + y³ = z³ - 1 (x < y < z) or 'Fermat near misses'. Arrange solutions by increasing values of z. Sequence gives values of x. A50788

G.f.: ∑_k>=0 2^k * x^k² / ∏_j=1..k (1 - x^j). A376948

Triangular array with the first half of the odd-indexed rows of A048004. A125105

Kekulé numbers for certain benzenoids (see the Cyvin-Gutman book for details). A123356

Number of 2 X n integer arrays with each element equal to the number of horizontal and antidiagonal neighbors not equal to itself. A265992

Number of nX5 0..1 arrays with every element unequal to 0, 1, 3 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. A318079

Triangle read by rows, giving Kekulé numbers for certain benzenoids (see the Cyvin-Gutman book for details). A123353

T(n,k)=Number of nXk 0..1 arrays with every element unequal to 0, 1, 3 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. A318082

Inverse of 1209th cyclotomic polynomial. A15218