Primes p such that p*(p-1) divides 3^(p-1)-1.

Terms

a(0) =2a(1) =5a(2) =17a(3) =41a(4) =101a(5) =257a(6) =401a(7) =641a(8) =881a(9) =1361a(10) =1601a(11) =2441a(12) =3089a(13) =4001a(14) =5441a(15) =5501a(16) =6101a(17) =12101a(18) =13121a(19) =13421a(20) =14081a(21) =14741a(22) =15101a(23) =16001a(24) =18041a(25) =20201a(26) =25301a(27) =25601a(28) =29921a(29) =30881