Properties of the Number 18103

Eighteen Thousand One Hundred Three

Basics

Value: 18102 → 18103 → 18104

Parity: odd

Prime: No

Previous Prime: 18097

Next Prime: 18119

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 43 × 421

Divisors: 1, 43, 421, 18103

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100011010110111

Octal: 43267

Duodecimal: A587

Hexadecimal: 46b7

Square: 327718609

Square Root: 134.54738942097688

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) = 4·a(n-1) + 7·a(n-2). A15532

Composites c where at least one base b with 1 < b < c exists such that b^c-1 == 1 (mod c²), i.e., composites c that are base-b 'Wieferich pseudoprimes' for at least one b between 1 and c. A267288

Row 4 of A328464: a(n) = A276156(16n - 8) / 30. A328467

Numbers of the form 6^j + 7^k, for j and k >= 0. A226819

Pseudoprimes to base 21. A20149

Pseudoprimes to base 33. A20161

Strong pseudoprimes to base 51. A20277

a(n) = least semiprime with factors not previously used containing integers 2n and 2n+1 as substrings. A86887

Number of walks within N³ (the first octant of Z³) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (0, 1, -1), (1, 0, 1), (1, 1, 1)}. A150389

Number of permutations of 1..n containing the relative rank sequence { 124563 } at any spacing. A159084