cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

Showing 1-2 of 2 results.

A302091 Primes of form 6*k^k + 5.

Original entry on oeis.org

11, 29, 167, 279941, 4941263
Offset: 1

Views

Author

Seiichi Manyama, Apr 01 2018

Keywords

Comments

The next term is too large to include.
The next term has 286 digits. - Harvey P. Dale, Oct 24 2021

Crossrefs

Primes of form b*k^k + b - 1: A216148 (b=2), A301811 (b=3), A301808 (b=4), A302089 (b=5), this sequence (b=6).
Cf. A302090.

Programs

  • Mathematica
    Select[Table[6 n^n + 5, {n, 20}], PrimeQ] (* Harvey P. Dale, Oct 24 2021 *)

Formula

a(n) = 6*A302090(n+1)^A302090(n+1) + 5.

A302089 Primes of form 5*k^k + 4.

Original entry on oeis.org

139, 15629, 1937102449
Offset: 1

Views

Author

Seiichi Manyama, Apr 01 2018

Keywords

Comments

The next term is too large to include.

Crossrefs

Primes of form b*k^k + b - 1: A216148 (b=2), A301811 (b=3), A301808 (b=4), this sequence (b=5), A302091 (b=6).
Cf. A302088.

Programs

  • PARI
    lista(nn) = forstep(n=1, nn, 2, if(ispseudoprime(p=5*n^n+4), print1(p, ", "))); \\ Altug Alkan, Apr 01 2018

Formula

a(n) = 5*A302088(n)^A302088(n) + 4.
Showing 1-2 of 2 results.

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