Numbers k such that k^2 divides 12^k - 1.

Terms

a(0) =1a(1) =11a(2) =253a(3) =11891a(4) =768361a(5) =36112967a(6) =61488361a(7) =154261943a(8) =2936791979a(9) =61057324141a(10) =67546215517a(11) =107342336783a(12) =186740152357a(13) =347036920549a(14) =429306186947a(15) =468493520891a(16) =635974117823a(17) =797688507253