%I

%S 3,23,28,34,47,86,92,107,632,723,754,772

%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