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A290241
Primes of the form 3^k - 8.
1
19, 73, 2179, 6553, 4782961, 3486784393, 31381059601, 381520424476945831628649898801, 2088595827392656793085408064780643444068898148936888424953199350259
OFFSET
1,1
LINKS
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
KEYWORD
nonn
AUTHOR
Robert Price, Jul 24 2017
STATUS
approved