Properties of the Number 18005

Eighteen Thousand Five

Basics

Value: 18004 → 18005 → 18006

Parity: odd

Prime: No

Previous Prime: 17989

Next Prime: 18013

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 5 × 13 × 277

Divisors: 1, 5, 13, 65, 277, 1385, 3601, 18005

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100011001010101

Octal: 43125

Duodecimal: A505

Hexadecimal: 4655

Square: 324180025

Square Root: 134.18271125595876

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

Expansion of (1+3·x)/(1-x²-2·x³). A159285

Positions of zeros in A165597. A165598

G.f.: (x+4·x³+x⁵)/((1-x)²*(1-x²)²*(1-x³)). A83707

Expansion of g.f. ∑_n>=1 qⁿ/(1-q^2·n-q^3·n). A368689

Coordination sequence for MgNi2, Position Mg2. A9935

a(n) = A005259(n) mod (n+1)³. A289289

Number of walks within N³ (the first octant of Z³) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 0, 1), (0, 1, 0), (1, -1, -1), (1, -1, 1)}. A148249

Integers k such that k = a² + b² = c² + d² and a + b = 3(c - d), where a, b, c and d are distinct positive integers. A369498

Smallest number whose cube has n digits. A18005

Smallest odd k > 1 such that k·2^prime(n) + 1 is prime. A253398