Numbers k such that both k and 2k-1 are Poulet numbers (Fermat pseudoprimes to base 2).

A298758

Numbers k such that both k and 2k-1 are Poulet numbers (Fermat pseudoprimes to base 2).

Terms

    a(0) =15709a(1) =65281a(2) =20770621a(3) =104484601a(4) =112037185a(5) =196049701a(6) =425967301a(7) =2593182901a(8) =16923897871a(9) =32548281361a(10) =45812984491a(11) =52035130951a(12) =55897227751a(13) =82907336737a(14) =90003640021a(15) =92010062101a(16) =138016057141a(17) =204082130071a(18) =310026150211a(19) =620006892121a(20) =622333751509

External references