Properties of the Number 18505

Eighteen Thousand Five Hundred Five

Basics

Value: 18504 → 18505 → 18506

Parity: odd

Prime: No

Previous Prime: 18503

Next Prime: 18517

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 5 × 3701

Divisors: 1, 5, 3701, 18505

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 100100001001001

Octal: 44111

Duodecimal: A861

Hexadecimal: 4849

Square: 342435025

Square Root: 136.03308421115798

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 length n+2 0..k arrays with some pair in every consecutive three terms totalling exactly k. A245869

Let f(k) = exp(π*sqrt(k)); sequence gives numbers k such that ceiling(f(k)) - f(k) < 1/10³. A127022

Third row of Pascal-(1,2,1) array A081577. A81583

Numbers n such that A003146(n) = floor(α³*n)+1, where α = 1.839... is the positive real zero of x³-x²-x-1. A278353

Triangle read by rows: T(n,k) (n >= 5, 4 <= k <= n-1) = number of lattice 3-polytopes of width larger than 1, size n, and k vertices. A319958

Denominators of continued fraction convergents to sqrt(183). A41339

Number of partitions of n not containing the number of distinct parts as a part. A239946

Numbers n such that n divides the (right) concatenation of all numbers <= n written in base 16 (most significant digit on right). A29509

Number of length n+2 0..6 arrays with some pair in every consecutive three terms totalling exactly 6. A245867

Number of length 5+2 0..n arrays with some pair in every consecutive three terms totalling exactly n. A245874