Numbers k such that (7^k - 1)/6 is prime.

A004063

Numbers k such that (7^k - 1)/6 is prime.

Terms

    a(0) =5a(1) =13a(2) =131a(3) =149a(4) =1699a(5) =14221a(6) =35201a(7) =126037a(8) =371669a(9) =1264699

External references