Primes p such that x^56 = 2 has no solution mod p, but x^28 = 2 has a solution mod p.

Terms

a(0) =353a(1) =577a(2) =593a(3) =1033a(4) =1049a(5) =1097a(6) =1153a(7) =1193a(8) =1201a(9) =1481a(10) =1601a(11) =1753a(12) =1889a(13) =2273a(14) =2281a(15) =2393a(16) =2473a(17) =2857a(18) =3049a(19) =3089a(20) =3121a(21) =3217a(22) =3313a(23) =3673a(24) =3761a(25) =3833a(26) =4001a(27) =4153a(28) =4217a(29) =4289