Numbers k such that 13 is the largest prime factor of k^2 - 1.

Terms

a(0) =12a(1) =14a(2) =25a(3) =27a(4) =51a(5) =53a(6) =64a(7) =79a(8) =129a(9) =131a(10) =155a(11) =181a(12) =209a(13) =274a(14) =287a(15) =337a(16) =391a(17) =649a(18) =701a(19) =703a(20) =727a(21) =846a(22) =1249a(23) =1351a(24) =1457a(25) =1574a(26) =2001a(27) =3431a(28) =4159a(29) =8191