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 1-3 of 3 results.

A364076 Numbers k such that (12^k - 1)^2 - 2 is prime.

Original entry on oeis.org

3, 29, 51, 7824, 15456, 22614, 28312, 47014, 68835
Offset: 1

Views

Author

Jeppe Stig Nielsen, Jul 03 2023

Keywords

Comments

Such primes are sometimes called Carol primes of base 12.

Links

Crossrefs

Cf. A091515 (b=2), A100901 (b=6), A100903 (b=10), A100905 (b=14), A364078 (b=18), A364080 (b=20), A100907 (b=22).
Cf. A364077

Programs

  • Mathematica
    Select[Range[1500],PrimeQ[(12^#-1)^2-2]&] (* James C. McMahon, Jan 04 2024 *)
  • PARI
    for(k=1,1200,ispseudoprime((12^k-1)^2-2)&&print1(k,", "))

A364078 Numbers k such that (18^k - 1)^2 - 2 is prime.

Original entry on oeis.org

2, 8, 30, 98, 110, 185, 912, 2514, 4074, 10208, 15123, 19395, 69354
Offset: 1

Views

Author

Jeppe Stig Nielsen, Jul 03 2023

Keywords

Comments

Such primes are sometimes called Carol primes of base 18.

Links

Crossrefs

Cf. A091515 (b=2), A100901 (b=6), A100903 (b=10), A364076 (b=12), A100905 (b=14), A364080 (b=20), A100907 (b=22).
Cf. A364079.

Programs

  • PARI
    for(k=1,1200,ispseudoprime((18^k-1)^2-2)&&print1(k,", "))

A364081 Numbers k such that (20^k + 1)^2 - 2 is prime.

Original entry on oeis.org

1, 15, 44, 77, 141, 208, 304, 1169, 3359, 5050, 22431, 34935, 92990
Offset: 1

Views

Author

Jeppe Stig Nielsen, Jul 03 2023

Keywords

Comments

Such primes are sometimes called Kynea primes of base 20.

Links

Crossrefs

Cf. A091513 (b=2), A100902 (b=6), A100904 (b=10), A364077 (b=12), A100906 (b=14), A364079 (b=18), A100908 (b=22).
Cf. A364080.

Programs

  • PARI
    for(k=1,1200,ispseudoprime((20^k+1)^2-2)&&print1(k,", "))
Showing 1-3 of 3 results.

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement.