Numbers n such that 4*7^n + 1 is prime.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =6a(5) =7a(6) =10a(7) =11a(8) =17a(9) =38a(10) =65a(11) =133a(12) =150a(13) =502a(14) =537a(15) =894a(16) =6442a(17) =16474a(18) =23642a(19) =40894a(20) =94133a(21) =101335a(22) =135737a(23) =224437a(24) =254621a(25) =266782