a(n) is the least triprime k such that k + n is the next triprime after k.

Terms

a(0) =27a(1) =18a(2) =63a(3) =8a(4) =45a(5) =12a(6) =20a(7) =130a(8) =138a(9) =154a(10) =52a(11) =30a(12) =561a(13) =78a(14) =1194a(15) =1930a(16) =4277a(17) =292a(18) =5343a(19) =26353a(20) =4255a(21) =7847a(22) =34773a(23) =18628a(24) =71718a(25) =72308a(26) =168114a(27) =64699a(28) =43209a(29) =227451