A289724 Primes of the form 3^k - 22.

5, 59, 19661, 1594301, 22876792454939, 2954312706550833698621, 8862938119652501095907, 6170365191715177779482467945369860501784408913594010934644126825341528124785676079587659

Offset: 1

Author

Robert Price, Sep 02 2017

Keywords

• nonn

Links

• Robert Price, Table of n, a(n) for n = 1..9
• F. Firoozbakht and M. F. Hasler, Variations on Euclid's formula for Perfect Numbers, JIS 13 (2010) #10.3.1.
• Henri and Renaud Lifchitz, PRP Records
• OpenPFGW Project, Primality Tester

Crossrefs

Cf. A000040, A219043 (corresponding k's).

Programs

Mathematica

Select[Table[3^k - 22, {k, 3, 100}], PrimeQ[#] &]

Formula

a(n) = 3^A219043(n) - 22. - Elmo R. Oliveira, Nov 12 2023