Smallest base-2 Fermat pseudoprime x that has ord(2,x) = n, or 0 if one does not exist.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =0a(7) =0a(8) =0a(9) =341a(10) =2047a(11) =0a(12) =0a(13) =5461a(14) =4681a(15) =4369a(16) =0a(17) =1387a(18) =0a(19) =13981a(20) =42799a(21) =15709a(22) =8388607a(23) =1105a(24) =1082401a(25) =22369621a(26) =0a(27) =645a(28) =256999a(29) =10261