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%I #9 Jan 31 2020 11:13:45
%S 0,1,2,5,9,11,21,42,46,61,69,70,78,99,183,361,1034,1291,1570,1838,5994
%N Numbers k such that (11*13^k -1)/2 is prime.
%C a(22) > 10^4. - _Jinyuan Wang_, Jan 31 2020
%t Do[ If[ PrimeQ[(11*13^n - 1)/2], Print[n]], {n, 0, 2700}]
%o (PARI) is(n)=ispseudoprime((11*13^n-1)/2) \\ _Charles R Greathouse IV_, Jun 13 2017
%K nonn,more
%O 1,3
%A _Robert G. Wilson v_, Sep 10 2000
%E a(21) from _Jinyuan Wang_, Jan 31 2020
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