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%I #12 Mar 21 2024 08:36:21
%S 3,23,28,34,47,86,92,107,632,723,754,772,9976,21116
%N Numbers k such that A109217(k) is prime.
%e a(2) = 23 because A109217(23) = 1101111011111101111111 is prime.
%Y Cf. A000037, A109217.
%K nonn,more
%O 1,1
%A _Jason Earls_, Jun 22 2005
%E Terms corrected by _Jinyuan Wang_, Mar 22 2020
%E a(13)-a(14) from _Michael S. Branicky_, Mar 19 2024