Primes p whose period of reciprocal equals (p-1)/6.

Terms

a(0) =79a(1) =547a(2) =643a(3) =751a(4) =907a(5) =997a(6) =1201a(7) =1213a(8) =1237a(9) =1249a(10) =1483a(11) =1489a(12) =1627a(13) =1723a(14) =1747a(15) =1831a(16) =1879a(17) =1987a(18) =2053a(19) =2551a(20) =2683a(21) =3049a(22) =3253a(23) =3319a(24) =3613a(25) =3919a(26) =4159a(27) =4507a(28) =4519a(29) =4801