Numbers n such that 7^n - 6 is prime.

Terms

a(0) =2a(1) =3a(2) =6a(3) =9a(4) =21a(5) =25a(6) =33a(7) =49a(8) =54a(9) =133a(10) =245a(11) =255a(12) =318a(13) =1023a(14) =1486a(15) =3334a(16) =6821a(17) =8555a(18) =11605a(19) =42502a(20) =44409a(21) =90291a(22) =92511a(23) =140303