Properties of the Number 12808

Twelve Thousand Eight Hundred Eight

Basics

Value: 12807 → 12808 → 12809

Parity: even

Prime: No

Previous Prime: 12799

Next Prime: 12809

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 2 ³ × 1601

Divisors: 1, 2, 4, 8, 1601, 3202, 6404, 12808

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11001000001000

Octal: 31010

Duodecimal: 74B4

Hexadecimal: 3208

Square: 164044864

Square Root: 113.17243480636087

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

Index of n-th prime in A386482, or -1 if that prime is missing. A386483

Irregular table read by rows: T(n,k) is the number of k-gons, k>=2, among all distinct circles that can be constructed from a 2·n square grid of points using only a compass. A359862

Third Lie-Betti number of a path graph on n vertices. A361230

a(n) is the index where A387090(n) appears in A386482. A386484

a(n) = 204·2ⁿ - 248. A278122

Number of hooked Skolem sequences of order n. A4076

Indices of primes in sequence defined by A(0) = 57, A(n) = 10·A(n-1) - 53 for n > 0. A101571

Expansion of (χ(-x) * χ(-x¹⁹))^-2 in powers of·where χ() is a Ramanujan θ function. A134004

Binomial transform of [1, 2, 3, 4, 0, 0, 0, ...]. A139488

For positive n with prime decomposition n = ∏_j=1..m (p_j^k_j) define A_n = ∑_j=1..m (p_j*k_j) and B_n = ∑_j=1..m (p_j^k_j). This sequence gives those n for which A_n and B_n are both prime and B_n = A_n + 2 (i.e., form a twin prime pair). A185718