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%I #12 Dec 27 2019 09:58:46
%S 0,1,2,3,4,12,23,66,69,98,139,235,243,253,269,283,932,1603,3066,5509,
%T 7539,8117,8168,15736,22867
%N Numbers k such that 5*7^k + 6 is prime.
%C a(26) > 23033. - _Jinyuan Wang_, Dec 27 2019
%t Do[ If[ PrimeQ[ 5*7^n + 6 ], Print[n] ], {n, 0, 5700} ]
%o (PARI) is(n)=ispseudoprime(5*7^n+6) \\ _Charles R Greathouse IV_, Jun 13 2017
%K nonn,more
%O 1,3
%A _Robert G. Wilson v_, Feb 24 2001
%E a(21)-a(25) from _Jinyuan Wang_, Dec 27 2019
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