Primes p for which the period of 1/p is a power of 2.

Terms

a(0) =3a(1) =11a(2) =17a(3) =73a(4) =101a(5) =137a(6) =257a(7) =353a(8) =449a(9) =641a(10) =1409a(11) =10753a(12) =15361a(13) =19841a(14) =65537a(15) =69857a(16) =453377a(17) =976193a(18) =1514497a(19) =5767169a(20) =5882353a(21) =6187457a(22) =8253953a(23) =8257537a(24) =70254593a(25) =167772161a(26) =175636481a(27) =302078977a(28) =458924033a(29) =639631361