Numbers n such that the n-th Lucas number is prime and can be written in the form a^2 + 7*b^2.

Terms

a(0) =0a(1) =4a(2) =5a(3) =7a(4) =16a(5) =17a(6) =19a(7) =37a(8) =53a(9) =71a(10) =113a(11) =353a(12) =503a(13) =613a(14) =1361a(15) =4787a(16) =8467a(17) =10691a(18) =14449a(19) =19649a(20) =51169a(21) =56003a(22) =81671a(23) =94823a(24) =159521a(25) =183089a(26) =193201a(27) =344293a(28) =532277a(29) =616787