The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

Thanks to everyone who made a donation during our annual appeal!
To see the list of donors, or make a donation, see the OEIS Foundation home page.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A185073 Numbers n such that (34^n - 1)/33 is prime. 1

%I

%S 13,1493,5851,6379,125101

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

%H H. Dubner, <a href="http://dx.doi.org/10.1090/S0025-5718-1993-1185243-9">Generalized repunit primes</a>, Math. Comp., 61 (1993), 927-930.

%H H. Lifchitz, <a href="http://www.primenumbers.net/Henri/us/MersFermus.htm">Mersenne and Fermat primes field</a>

%H P. Bourdelais,<a href="https://listserv.nodak.edu/cgi-bin/wa.exe?A2=NMBRTHRY;417ab0d6.0906">A Generalized Repunit Conjecture</a>

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

%o (PARI) isok(n) = isprime((34^n-1)/33); \\ _Michel Marcus_, Mar 13 2016

%o (PARI) lista(nn) = for(n=1, nn, if(ispseudoprime((34^n - 1)/33), print1(n, ", "))); \\ _Altug Alkan_, Mar 13 2016

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

%K hard,more,nonn

%O 1,1

%A _Robert Price_, Mar 10 2012

%E a(5)=125101 corresponds to a probable prime discovered by _Paul Bourdelais_, Nov 20 2017

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified January 21 21:30 EST 2020. Contains 331128 sequences. (Running on oeis4.)