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%I #10 Jul 14 2023 08:47:14
%S 1,3,5,9,23,65,95,129,161,341,439,771,819,1031,1099,1443,1923,5793,
%T 15527,15963
%N Numbers k such that 7*11^k + 2 is prime.
%C Values corresponding to 5, 9, 23, 65, 95, 129, 161, 341, 439, 771, 819, 1031, 1099 and 1443 (1504 digits) have been certified prime with Primo. Values for 1923 (2004 digits) and 5793 (6034 digits) are probable primes. There are no other terms <= 6000.
%o (PARI) for(n=1,6000,if(isprime(7*11^n+2),print1(n,",")))
%K nonn,more
%O 1,2
%A _Rick L. Shepherd_, May 03 2003
%E a(19)-a(20) from _Michael S. Branicky_, Jul 14 2023
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