Odd integers k>=5 such that 2^((k-1)/2)-1 == 0 (mod k*(k-3)/2).

Terms

a(0) =73a(1) =241a(2) =2593a(3) =5113a(4) =8713a(5) =18433a(6) =53593a(7) =55681a(8) =86113a(9) =102241a(10) =126337a(11) =127873a(12) =158113a(13) =181721a(14) =184369a(15) =186049a(16) =208393a(17) =219313a(18) =221537a(19) =241921a(20) =262657a(21) =267913a(22) =282313a(23) =314161a(24) =314401a(25) =341641a(26) =362521a(27) =398441a(28) =415873a(29) =450913