A recurrence relation conditioned on the primality of the preceding terms.

Terms

a(0) =1a(1) =2a(2) =3a(3) =5a(4) =8a(5) =13a(6) =21a(7) =34a(8) =13a(9) =47a(10) =60a(11) =107a(12) =167a(13) =274a(14) =441a(15) =167a(16) =608a(17) =775a(18) =167a(19) =942a(20) =1109a(21) =2051a(22) =3160a(23) =1109a(24) =4269a(25) =5378a(26) =1109a(27) =6487a(28) =7596a(29) =1109