Numbers k that divide 16^k + 1.

Terms

a(0) =1a(1) =17a(2) =289a(3) =4913a(4) =83521a(5) =1419857a(6) =6029713a(7) =12027313a(8) =24137569a(9) =85525793a(10) =102505121a(11) =204464321a(12) =410338673a(13) =1453938481a(14) =1742587057a(15) =3475893457a(16) =6975757441a(17) =24716954177a(18) =29623979969a(19) =59090188769a(20) =111612202577a(21) =118587876497a(22) =420188221009a(23) =500540685121a(24) =503607659473