Properties of the Number 15124

Fifteen Thousand One Hundred Twenty-Four

Basics

Value: 15123 → 15124 → 15125

Parity: even

Prime: No

Previous Prime: 15121

Next Prime: 15131

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 2 ² × 19 × 199

Divisors: 1, 2, 4, 19, 38, 76, 199, 398, 796, 3781

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 11101100010100

Octal: 35424

Duodecimal: 8904

Hexadecimal: 3b14

Square: 228735376

Square Root: 122.97967311714567

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

a(n) = 8·a(n-1) - a(n-2); a(0) = 1, a(1) = 4. A1091

a(n) = Lucas(n+2) - 3. A27961

Square array A(n,k), n >= 0, k >= 0, read by antidiagonals, where A(n,k) is Chebyshev polynomial of the first kind T_n(x), evaluated at x=k. A322836

Base-7 Armstrong or narcissistic numbers, written in base 7. A10349

Number triangle associated to Chebyshev polynomials of first kind. A101124

T(n,k) = Number of n X k 0..1 arrays with every element equal to 0, 1, 2, 4, 5 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. A301491

a(n)*a(n+3) - a(n+1)*a(n+2) = 3, given a(0)=a(1)=1, a(2)=4. A80871

G.f.: 1 / G(0), where G(k) = 1 - q^k+1 / (1 - q^k+1/G(k+2) ). A226729

Expansion of (∏_j>=1 (1-(-x)^j) - 1)²⁰ in powers of x. A47645

a(n) = T_n(n-1) where T_n(x) is a Chebyshev polynomial of the first kind. A323117