Numbers k such that 13*4^k + 1 is prime.

Terms

a(0) =1a(1) =4a(2) =5a(3) =10a(4) =14a(5) =41a(6) =94a(7) =154a(8) =158a(9) =500a(10) =14140a(11) =19004a(12) =21928a(13) =44009a(14) =54629a(15) =57148a(16) =260653a(17) =281228a(18) =342280a(19) =519448a(20) =749938a(21) =930866