Properties of the Number 18663

Eighteen Thousand Six Hundred Sixty-Three

Basics

Value: 18662 → 18663 → 18664

Parity: odd

Prime: No

Previous Prime: 18661

Next Prime: 18671

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 3 × 6221

Divisors: 1, 3, 6221, 18663

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100100011100111

Octal: 44347

Duodecimal: A973

Hexadecimal: 48e7

Square: 348307569

Square Root: 136.6125909277765

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

a(n) = A273059(4n). A275916

a(n) = 10·n² + 4·n + 1. A272039

n(k) is the minimum n that requires at least k to make 2·Prime[n]+Prime[k] a prime. A114234

a(n) = 7·a(n-1) - 6·a(n-2), n>1; a(0)=1, a(1)=3. A152596

Convolution of Catalan numbers and squares. A14316

Take a squarefree semiprime and take the difference of its prime factors. If it is a squarefree semiprime repeat the process. Sequence lists the squarefree semiprimes that generate other squarefree semiprimes only in the first k steps of this process. Case k = 4. A296811

Numbers n such that 289·2ⁿ-1 is prime. A50903

Numbers k such that (2·10^k - 179)/3 is prime. A295394

Take a squarefree semiprime and take the difference of its prime factors. If it is a squarefree semiprime repeat the process. Sequence lists the squarefree semiprimes that generate other squarefree semiprimes only in the first k steps of this process. Case k = 5. A296812

Take a squarefree semiprime and take the difference of its prime factors. If it is a squarefree semiprime repeat the process. Sequence lists the squarefree semiprimes that generate other squarefree semiprimes only in the first k steps of this process. Case k = 6. A296813