Properties of the Number 18388

Eighteen Thousand Three Hundred Eighty-Eight

Basics

Value: 18387 → 18388 → 18389

Parity: even

Prime: No

Previous Prime: 18379

Next Prime: 18397

Digit Sum: 28

Digital Root: 1

Palindrome: No

Factorization: 2 ² × 4597

Divisors: 1, 2, 4, 4597, 9194, 18388

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 100011111010100

Octal: 43724

Duodecimal: A784

Hexadecimal: 47d4

Square: 338118544

Square Root: 135.60235986147143

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

Number T(n,k) of set partitions of [n] with minimal block length multiplicity equal to k; triangle T(n,k), n>=0, 0<=k<=n, read by rows. A271424

Number of n-node labeled connected mating graphs, cf. A006024. A92430

Pascal-(1,8,1) array. A143683

Costas arrays such that the corresponding permutation is connected. A213339

G.f. satisfies A(x) = 1 + x/(1 - x³) * A(x/(1 - x³)). A360890

a(n) is the number of essentially different ways in which the integers 1,2,3,...,n can be arranged in a sequence such that all pairs of adjacent integers sum to a prime number. Rotations and reversals are counted only once. A73452

Number of partitions of n into parts with at most one part <= 2. A121659

Number of set partitions of [n] with minimal block length multiplicity equal to one. A271426

Numbers k such that k and k² use only the digits 1, 3, 4, 5 and 8. A137022

A functionally symmetric Polynomial as a triangle of coefficients: p(x,n)=If[n == 0, 1, (x + 1)ⁿ + 2^{n - 3}*Sum[(3^m-1 + 2·m+(n-1) )*x^m*(1 + x^{n - 2·m}), {m, 1, n - 1}]]. A146959