Numbers k such that 4k - 1 divides 2^k + k^2.

Terms

a(0) =1a(1) =5a(2) =2071a(3) =33421a(4) =58061a(5) =1977071a(6) =7011161a(7) =10144571a(8) =10189721a(9) =166311841a(10) =173618771a(11) =215766701a(12) =240623221a(13) =341359721a(14) =341455271a(15) =389192441a(16) =490814481a(17) =524456461a(18) =585387477a(19) =888576461a(20) =1123952441a(21) =1276706071a(22) =2005030751a(23) =2244832943a(24) =2863311531a(25) =3104590331a(26) =3904529471