Properties of the Number 19487

Nineteen Thousand Four Hundred Eighty-Seven

Basics

Value: 19486 → 19487 → 19488

Parity: odd

Prime: No

Previous Prime: 19483

Next Prime: 19489

Digit Sum: 29

Digital Root: 2

Palindrome: No

Factorization: 13 × 1499

Divisors: 1, 13, 1499, 19487

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100110000011111

Octal: 46037

Duodecimal: B33B

Hexadecimal: 4c1f

Square: 379743169

Square Root: 139.59584521037866

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 base b > 1 such that both prime(n) and prime(n+1) are base-b Wieferich primes, i.e., p = prime(n) satisfies b^p-1 == 1 (mod p²) and q = prime(n+1) satisfies b^q-1 == 1 (mod q²). A259075

For each permutation p of {1,2,...,n} define min(p) = min{ p(i) + i : i = 1..n }; a(n) is the sum of min(p) of all p. A129591

a(n) = n*(2·n² + 5·n + 17)/2. A163661

Expansion of 1/(1-x²-x³+x⁷-x⁸+x¹⁰). A174577

The distribution of the distance from the first weak subcedance to 1 on permutations. A350158

G.f. satisfies A(x) = ∑_n>=1 A(x³)ⁿ / A(x^2·n), with A(0) = 0 and A'(0) = 1. A383376

"AGK" (ordered, elements, unlabeled) transform of 2,1,1,1,... A32024

Number of base 17 circular n-digit numbers with adjacent digits differing by 3 or less. A125327

Number of numbers in n-th generation of the tree of Gaussian rationals at A233696. A245264

a(n) = 3·a(n-1) - a(n-2) + 2·a(n-3) - 2·a(n-4). A19487