Fermat pseudoprimes to base 4.

Terms

a(0) =15a(1) =85a(2) =91a(3) =341a(4) =435a(5) =451a(6) =561a(7) =645a(8) =703a(9) =1105a(10) =1247a(11) =1271a(12) =1387a(13) =1581a(14) =1695a(15) =1729a(16) =1891a(17) =1905a(18) =2047a(19) =2071a(20) =2465a(21) =2701a(22) =2821a(23) =3133a(24) =3277a(25) =3367a(26) =3683a(27) =4033a(28) =4369a(29) =4371