Properties of the Number 15115

Fifteen Thousand One Hundred Fifteen

Basics

Value: 15114 → 15115 → 15116

Parity: odd

Prime: No

Previous Prime: 15107

Next Prime: 15121

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 5 × 3023

Divisors: 1, 5, 3023, 15115

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

4823 Try Today's Challenge

Representations

Binary: 11101100001011

Octal: 35413

Duodecimal: 88B7

Hexadecimal: 3b0b

Square: 228463225

Square Root: 122.94307625889309

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

Triangular array that counts rooted polyominoes. A38622

Numbers using only digits 1 and 5. A276037

Riordan array (1/sqrt(1-2·x-3·x²), M(x)-1) where M(x) is the g.f. of the Motzkin numbers A001006. A114422

Number of directed animals of size n (k=1 column of A038622); number of (s(0), s(1), ..., s(n)) such that s(i) is a nonnegative integer and |s(i) - s(i-1)| <= 1 for i = 1,2,...,n, where s(0) = 2; also sum of row n+1 of array T in A026323. A5774

Start with a single hexagon; at n-th generation add a hexagon at each expandable vertex (this is the "vertex to side" version); a(n) is the sum of all label values at n-th generation. (See comment for construction rules.) A247905

Number of compositions of n whose non-adjacent parts are strictly decreasing. A333193

Concatenations x||1||x for numbers x. A392225

Semiprime numbers whose digit string can be partitioned into three parts such that the product of the first two parts equals the third part. A280636

Triangle, read by rows, of pairwise sums of trinomial coefficients (A027907). A104029

Triangle whose k-th column has e.g.f. exp(x)*sum{j=0..k, Bessel_I(k+j,2x)}. A116401