Numbers k such that k$ + 1 is prime. Here '$' denotes the swinging factorial function (A056040).

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =4a(5) =5a(6) =8a(7) =9a(8) =14a(9) =15a(10) =24a(11) =27a(12) =31a(13) =38a(14) =44a(15) =45a(16) =49a(17) =67a(18) =76a(19) =92a(20) =99a(21) =119a(22) =124a(23) =133a(24) =136a(25) =139a(26) =144a(27) =168a(28) =171a(29) =185