Primes p whose period of reciprocal equals (p-1)/4.

Terms

a(0) =53a(1) =173a(2) =277a(3) =317a(4) =397a(5) =769a(6) =773a(7) =797a(8) =809a(9) =853a(10) =1009a(11) =1013a(12) =1093a(13) =1493a(14) =1613a(15) =1637a(16) =1693a(17) =1721a(18) =2129a(19) =2213a(20) =2333a(21) =2477a(22) =2521a(23) =2557a(24) =2729a(25) =2797a(26) =2837a(27) =3329a(28) =3373a(29) =3517