Positive integers k such that k!!! - 1 = A007661(k) - 1 is prime.

Terms

a(0) =3a(1) =4a(2) =6a(3) =8a(4) =20a(5) =26a(6) =36a(7) =50a(8) =60a(9) =114a(10) =135a(11) =138a(12) =248a(13) =315a(14) =351a(15) =429a(16) =642a(17) =5505a(18) =8793a(19) =12086a(20) =13580a(21) =23109a(22) =34626a(23) =34706a(24) =56282a(25) =57675a(26) =58298