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%I #19 Aug 27 2023 01:43:41
%S 11,31,41,1571,25771,181981
%N Primes p such that (53^p - 1)/52 is also prime.
%H R. Fischer, <a href="http://www.fermatquotient.com/PrimSerien/GenRepu.txt">Generalized repunit primes of the form (B^N-1)/(B-1)</a>
%K nonn,more
%O 1,1
%A _Vincenzo Librandi_, Mar 05 2010
%E Partially checked by _Michael B. Porter_, Jun 16 2010
%E a(5)-a(6) from R. Fischer's webpage added by _Max Alekseyev_, Aug 26 2023