A290241 Primes of the form 3^k - 8.

19, 73, 2179, 6553, 4782961, 3486784393, 31381059601, 381520424476945831628649898801, 2088595827392656793085408064780643444068898148936888424953199350259

Offset

1,1

Links

Robert Price, Table of n, a(n) for n = 1..11

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

Formula

a(n) = 3^A217135(n) - 8. - Elmo R. Oliveira, Nov 09 2023

Mathematica

Select[Table[3^k - 8], {k, 2, 100}], PrimeQ[#] &]

Prog

(PARI) lista(nn) = for(n=3, nn, if(isprime(p=3^n-8), print1(p", "))); \\ Altug Alkan, Jul 25 2017

Crossrefs

Cf. A000040, A217135 (corresponding k's).

Sequence in context: A118593 A047979 A373668 * A159997 A073566 A098467

Adjacent sequences: A290238 A290239 A290240 * A290242 A290243 A290244

Keyword

nonn

Author

Robert Price, Jul 24 2017

Status

approved