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.

A120024 Numbers k such that 2*6^k-1 and 2*6^k+1 are twin primes.

Original entry on oeis.org

1, 2, 3, 4, 2175
Offset: 1

Views

Author

Pierre CAMI, Jun 04 2006

Keywords

Comments

No more terms through 10^4. - Ryan Propper, Dec 31 2007
No more terms through 2.5*10^5, using comments in A057472, A120023. - Michael S. Branicky, Sep 29 2024

Crossrefs

Intersection of A057472 and A120023.

Programs

  • Mathematica
    Select[Range[2175],PrimeQ[2*6^#-1]&&PrimeQ[2*6^#+1]&] (* James C. McMahon, Sep 24 2024 *)

A205776 Primes of the form 2*6^n+1.

Original entry on oeis.org

3, 13, 73, 433, 2593, 120932353, 725594113, 33853318889473, 7312316880125953, 12281884428929630994433, 160409934466124808814066151718913, 44904515414709114480174422247585349633, 452534055376752384160395854386801887645007873
Offset: 1

Views

Author

Vladimir Joseph Stephan Orlovsky, Jan 31 2012

Keywords

Links

Crossrefs

Cf. A120023, A205771

Programs

  • Mathematica
    Select[2*6^Range[0, 500] + 1, PrimeQ]
Showing 1-2 of 2 results.

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

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