Numbers k such that prime(k+1) == 4 (mod k).

Terms

a(0) =1a(1) =3a(2) =11a(3) =13a(4) =69a(5) =71a(6) =637225a(7) =637253a(8) =637313a(9) =637327a(10) =4124459a(11) =4124685a(12) =27067033a(13) =179993017a(14) =179993023a(15) =1208198853a(16) =8179002097a(17) =8179002109a(18) =55762149091