A185073 Numbers n such that (34^n - 1)/33 is prime.

13, 1493, 5851, 6379, 125101

Offset

1,1

Links

Table of n, a(n) for n=1..5.

H. Dubner, Generalized repunit primes, Math. Comp., 61 (1993), 927-930.

H. Lifchitz, Mersenne and Fermat primes field

P. Bourdelais, A Generalized Repunit Conjecture

Mathematica

Select[Prime[Range[100]], PrimeQ[(34^#-1)/33]&]

Prog

(PARI) isok(n) = isprime((34^n-1)/33); \\ Michel Marcus, Mar 13 2016
(PARI) lista(nn) = for(n=1, nn, if(ispseudoprime((34^n - 1)/33), print1(n, ", "))); \\ Altug Alkan, Mar 13 2016

Crossrefs

Cf. A028491, A004061, A004062, A004063, A004064, A004023, A005808, A016054, A006032, A006033, A006034, A006035, A098438, A127995-A128005.

Sequence in context: A242562 A201357 A220551 * A185193 A066457 A203515

Adjacent sequences: A185070 A185071 A185072 * A185074 A185075 A185076

Keyword

hard,more,nonn

Author

Robert Price, Mar 10 2012

Extensions

a(5)=125101 corresponds to a probable prime discovered by Paul Bourdelais, Nov 20 2017

Status

approved