Numbers k such that k^2 divides 16^k-1.

Terms

a(0) =1a(1) =3a(2) =5a(3) =15a(4) =21a(5) =39a(6) =55a(7) =105a(8) =155a(9) =165a(10) =195a(11) =205a(12) =273a(13) =465a(14) =609a(15) =615a(16) =903a(17) =915a(18) =1155a(19) =1265a(20) =1365a(21) =1705a(22) =2067a(23) =2145a(24) =2255a(25) =2265a(26) =2373a(27) =2667a(28) =3045a(29) =3081