Numbers k such that k!6 + 6 is prime, where k!6 is the sextuple factorial number (A085158 ).

Terms

a(0) =1a(1) =5a(2) =7a(3) =11a(4) =13a(5) =17a(6) =37a(7) =43a(8) =55a(9) =107a(10) =139a(11) =149a(12) =157a(13) =211a(14) =223a(15) =343a(16) =373a(17) =409a(18) =523a(19) =12049a(20) =16457a(21) =17143a(22) =17543a(23) =18391a(24) =25829a(25) =25945a(26) =31307a(27) =34601a(28) =41687