Properties of the Number 8129

Eight Thousand One Hundred Twenty-Nine

Basics

Value: 8128 → 8129 → 8130

Parity: odd

Prime: No

Previous Prime: 8123

Next Prime: 8147

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 11 × 739

Divisors: 1, 11, 739, 8129

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1111111000001

Octal: 17701

Duodecimal: 4855

Hexadecimal: 1fc1

Square: 66080641

Square Root: 90.160967164289

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

Numbers k such that k, k+2, k+4, k+6, k+8, k+10, k+12 and k+14 are semiprimes. A82919

Fibonacci sequence beginning 2, 7. A22113

Numbers k such that k, k+2, k+4, k+6, k+8, k+10, k+12 are semiprimes. A92129

a(n) = T(2n-1,n-1), T given by A026769. Also T(2n+1,n+1), T given by A026780. A26773

a(n) = T(n, floor(n/2)), T given by A026769. A26775

Numbers k such that k, k+2, k+4, k+6, k+8, k+10 are semiprimes. A92128

a(n) = (9n² + 9n + 4)/2. A62123

Numbers k such that k, k+2, k+4, k+6, k+8 are semiprimes. A92127

a(n) = n*(n-th prime) + (n+1)*((n+1)-th prime). A152117

Least integer m > 0 with π(m·n) = σ(m+n), where π(.) and σ(.) are given by A000720 and A000203. A247604