Properties of the Number 18342

Eighteen Thousand Three Hundred Forty-Two

Basics

Value: 18341 → 18342 → 18343

Parity: even

Prime: No

Previous Prime: 18341

Next Prime: 18353

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 2 × 3 ² × 1019

Divisors: 1, 2, 3, 6, 9, 18, 1019, 2038, 3057, 6114

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100011110100110

Octal: 43646

Duodecimal: A746

Hexadecimal: 47a6

Square: 336428964

Square Root: 135.43264008354853

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

Bisection of Lucas triangle A060922: odd-indexed members of column sequences of A060922 (not counting leading zeros). A60924

Self-convolution of Lucas numbers. A4799

Numbers equal to a permutation (or rearrangement) of the digits of the sum of their proper divisors. Rearrangements which cause leading zeros are excluded. A85844

Number of integer compositions of n that are the 0-prepended first sums of some finite sequence of distinct integers. A392702

Expansion of 1/(x¹⁰*p(x + 1/x)), where p(x) = 1 - x³ - x⁵ - x⁷ + x¹⁰ is a Salem polynomial. A143471

a(n) = ∑_p M(n-k; p₁-1, ..., p_k-1) * ∏_j=1..k a(p_j), where p = (p₁, ..., p_k) ranges over all partitions of n into smaller parts (k is a partition length and M is a multinomial). A327729

Least K such that K*(prime(100·n)^100·n)-1 is prime with prime(n)=n-th prime. A129245

This sequence and A139143 are complements. a(1) = 1, A139143(1) = 2, a(n+1) = a(n) + ∑_{k = 1..n} A139143(k). A139142

a(n) = 9·n² + 21·n - 6 (n>=1). A304374

Padovan like sequence: a(n) = a(n-2) + a(n-3) for n>3, a(1)=2, a(2)=2, a(3)=0. A276275