Properties of the Number 18901

Eighteen Thousand Nine Hundred One

Basics

Value: 18900 → 18901 → 18902

Parity: odd

Prime: No

Previous Prime: 18899

Next Prime: 18911

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 41 × 461

Divisors: 1, 41, 461, 18901

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100100111010101

Octal: 44725

Duodecimal: AB31

Hexadecimal: 49d5

Square: 357247801

Square Root: 137.48090776540573

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

Table by antidiagonals of T(n,k) = n·T(n,k-1) + T(n,k-2) starting with T(n,1) = 1. A73133

Array A(n,k) = n·A(n,k-1) + A(n,k-2) read by upward antidiagonals, starting A(n,0) = 0, A(n,1) = 1. A172236

a(0) = 1, a(1) = 5, a(n+1) = 5·a(n) + a(n-1). A52918

25-gonal numbers: a(n) = n*(23·n-21)/2. A255184

Denominators of continued fraction convergents to sqrt(29). A41047

a(0)=1, a(1)=1, a(n)=7·a(n/2) for n=2,4,6,..., a(n)=6·a((n-1)/2)+a((n+1)/2) for n=3,5,7,.... A116522

Hypotenuses of primitive Pythagorean triples in A195574 and A195575. A195576

Expansion of g.f. (1-2·x+51·x²)/(1-x)³. A257352

Triangle, read by rows, T(n, k) = Fibonacci(n, k), where Fibonacci(n, x) is the Fibonacci polynomial. A117715

Odd composite integers m such that A087130(m) == 5 (mod m). A335671