Numbers k such that 3*7^k + 2 is prime.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =5a(5) =6a(6) =7a(7) =10a(8) =39a(9) =99a(10) =115a(11) =158a(12) =697a(13) =966a(14) =2602a(15) =2899a(16) =4057a(17) =5226a(18) =8279a(19) =17946a(20) =44850