A289716 Primes of the form 3^k - 16.

11, 227, 177131, 14348891, 2153693963075557766310731, 834385168331080533771857328695267, 171792506910670443678820376588540424234035840651, 2025465365549235636389379590279612045176776005882811610332067323733925450296747107485272801773488928849912971

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, A219039 (corresponding k's).

Programs

Mathematica

Select[Table[3^k - 16, {k, 3, 100}], PrimeQ[#] &]

Formula

a(n) = 3^A219039(n) - 16. - Elmo R. Oliveira, Nov 12 2023