Primes p for which the period of reciprocal = (p-1)/8.

Terms

a(0) =41a(1) =241a(2) =1601a(3) =1609a(4) =2441a(5) =2969a(6) =3041a(7) =3449a(8) =3929a(9) =4001a(10) =4409a(11) =5009a(12) =6089a(13) =6521a(14) =6841a(15) =8161a(16) =8329a(17) =8609a(18) =9001a(19) =9041a(20) =9929a(21) =13001a(22) =13241a(23) =14081a(24) =14929a(25) =16001a(26) =16481a(27) =17489a(28) =17881a(29) =18121