Numbers k such that 4*k^2 + 1 is prime.

Terms

a(0) =1a(1) =2a(2) =3a(3) =5a(4) =7a(5) =8a(6) =10a(7) =12a(8) =13a(9) =18a(10) =20a(11) =27a(12) =28a(13) =33a(14) =37a(15) =42a(16) =45a(17) =47a(18) =55a(19) =58a(20) =60a(21) =62a(22) =63a(23) =65a(24) =67a(25) =73a(26) =75a(27) =78a(28) =80a(29) =85