Properties of the Number 18560

Eighteen Thousand Five Hundred Sixty

Basics

Value: 18559 → 18560 → 18561

Parity: even

Prime: No

Previous Prime: 18553

Next Prime: 18583

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 2 ⁷ × 5 × 29

Divisors: 1, 2, 4, 5, 8, 10, 16, 20, 29, 32

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100100010000000

Octal: 44200

Duodecimal: A8A8

Hexadecimal: 4880

Square: 344473600

Square Root: 136.23509092741122

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

Narayana's cows sequence: a(0) = a(1) = a(2) = 1; thereafter a(n) = a(n-1) + a(n-3). A930

a(n) = a(n-1) + a(n-3) for n >= 3, with a(0) = 1, a(1) = a(2) = 0. This recurrence can also be used to define a(n) for n < 0. A78012

Longest edge a of smallest (measured by the longest edge) primitive Euler bricks (a, b, c, sqrt(a² + b²), sqrt(b² + c²), sqrt(a² + c²) are integers). A31173

Expansion of (1-x)²/(1 - 4·x + 3·x² - x³). A52544

Expansion of (1 - x)/(1 + x - 2·x² + x³). A78039

Number of odd-length integer partitions of n with integer alternating product. A347444

a(n) = n-1, if n <= 2, otherwise A107458(n-1) + A107458(n-2). A135851

Number of ways to tile a 2 X n room with 1 X 2 Tatami mats. At most 3 Tatami mats may meet at a point. A68921

a(0) = 0, a(1) = 1, a(2) = 2; for n > 2, a(n) = a(n-1) + 2·a(n-2) + a(n-3). A141015

Numbers with prime signature {7,1,1}, i.e., of form p⁷*q·r with p, q and r distinct primes. A179696