Properties of the Number 15555

Fifteen Thousand Five Hundred Fifty-Five

Basics

Value: 15554 → 15555 → 15556

Parity: odd

Prime: No

Previous Prime: 15551

Next Prime: 15559

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 3 × 5 × 17 × 61

Divisors: 1, 3, 5, 15, 17, 51, 61, 85, 183, 255

Polygonal

Triangular: No

Square: No

Pentagonal: Yes

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 11110011000011

Octal: 36303

Duodecimal: 9003

Hexadecimal: 3cc3

Square: 241958025

Square Root: 124.71968569556292

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

T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with all 2X2 subblock sums the same. A184003

Subgroups of nimber addition interpreted as binary numbers. A190939

List of codewords in binary lexicode with Hamming distance 8 written as decimal numbers. A75940

Pentagonal numbers (A000326) which are the sum of 2 other positive pentagonal numbers. A136117

Expansion of g.f. (1+4·x)/((1-x)*(1-10·x)). A99915

Pentagonal numbers (A000326) whose digit reversal is a semiprime (A001358). A115709

a(n) = a(n-1) + 2·a(floor(n/2)) if n > 0, otherwise 1. A58039

Primitive elements of A119432. A119433

Rows of negated binary Walsh matrices interpreted as reverse binary numbers. A228540

G.f. A(x) satisfies: 1 - x = ∑_n>=0 (x^2·n + (-1)ⁿ*A(x))ⁿ. A352818