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,", "))

A364079 Numbers k such that (18^k + 1)^2 - 2 is prime.

Original entry on oeis.org

1, 10, 21, 25, 31, 1083, 40485, 82516
Offset: 1

Views

Author

Jeppe Stig Nielsen, Jul 03 2023

Keywords

Comments

Such primes are sometimes called Kynea primes of base 18.

Links

Crossrefs

Cf. A091513 (b=2), A100902 (b=6), A100904 (b=10), A364077 (b=12), A100906 (b=14), A364081 (b=20), A100908 (b=22).
Cf. A364078.

Programs

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

A364080 Numbers k such that (20^k - 1)^2 - 2 is prime.

Original entry on oeis.org

1, 2, 53, 183, 1281, 1300, 8041, 29936, 72820
Offset: 1

Views

Author

Jeppe Stig Nielsen, Jul 03 2023

Keywords

Comments

Such primes are sometimes called Carol primes of base 20.

Links

Crossrefs

Cf. A091515 (b=2), A100901 (b=6), A100903 (b=10), A364076 (b=12), A100905 (b=14), A364078 (b=18), A100907 (b=22).
Cf. A364081.

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.

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