Properties of the Number 18212

Eighteen Thousand Two Hundred Twelve

Basics

Value: 18211 → 18212 → 18213

Parity: even

Prime: No

Previous Prime: 18211

Next Prime: 18217

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 2 ² × 29 × 157

Divisors: 1, 2, 4, 29, 58, 116, 157, 314, 628, 4553

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100011100100100

Octal: 43444

Duodecimal: A658

Hexadecimal: 4724

Square: 331676944

Square Root: 134.9518432626987

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

Smallest even k such that the pair {k-3,k-1} is not a twin prime pair and lpf(k-1) > lpf(k-3) >= prime(n), where lpf = least prime factor (A020639). A242720

Smallest even number k such that lpf(k-3) = prime(n) while lpf(k-1) > lpf(k-3), where lpf=least prime factor (A020639). A242490

Let s(n,j) be ∑_i=1..j (prime(primepi(n) + i) mod n). Numbers n such that there exists j with s(n,j) = n. A274423

Numerators of continued fraction convergents to sqrt(263). A41492

a(n) is the smallest positive integer m such that 2ⁿ appears as the denominator of a convergent to sqrt(m). A338308

Number of free linear polycubes of size n, identifying rotations and reflections and avoiding the eight corner-connected neighbors. A363204

a(n) = a(n-1) + a(n-2) - a(n-3) - a(n-8), starting 1,1,2,2,3,3,4,4. A172397

Numbers having four 4's in base 8. A43440

Numbers n such that n | 8ⁿ + 7ⁿ + 6ⁿ + 5ⁿ + 4ⁿ + 3ⁿ + 2ⁿ + 1ⁿ. A56751

Number of permutations of 1..n containing the relative rank sequence { 235614 } at any spacing. A159147