Strong pseudoprimes to base 4.

Terms

a(0) =341a(1) =1387a(2) =2047a(3) =3277a(4) =4033a(5) =4371a(6) =4681a(7) =5461a(8) =8321a(9) =8911a(10) =10261a(11) =13747a(12) =14491a(13) =15709a(14) =15841a(15) =19951a(16) =29341a(17) =31621a(18) =42799a(19) =49141a(20) =49981a(21) =52633a(22) =60787a(23) =65077a(24) =65281a(25) =74665a(26) =80581a(27) =83333a(28) =85489a(29) =88357