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%I #20 Aug 05 2021 02:30:37
%S 7,112153,151153
%N Numbers k such that (29^k + 1)/30 is a prime.
%C Only the first term is proved to be a prime (so far). The rest correspond to probable primes.
%C a(2) from Lelio R. Paula.
%H P. Bourdelais, <a href="https://listserv.nodak.edu/cgi-bin/wa.exe?A2=NMBRTHRY;417ab0d6.0906">A Generalized Repunit Conjecture</a>, NMBRTHRY, 25 Jun 2009.
%H Henri & Renaud Lifchitz, <a href="http://www.primenumbers.net/prptop/prptop.php">PRP Records</a>
%K nonn,more,bref
%O 1,1
%A _Paul Bourdelais_, Sep 05 2017