Numbers k such that A004154(k) - 1 is prime.

Terms

a(0) =3a(1) =4a(2) =5a(3) =6a(4) =7a(5) =13a(6) =14a(7) =19a(8) =20a(9) =28a(10) =37a(11) =99a(12) =100a(13) =108a(14) =141a(15) =304a(16) =442a(17) =682a(18) =3641a(19) =4076