Numbers m such that m^2 divides 2^k - 1 for some k, 0 < k <= m.

Terms

a(0) =1a(1) =1093a(2) =3279a(3) =3511a(4) =5465a(5) =7651a(6) =9837a(7) =10533a(8) =14209a(9) =16395a(10) =17555a(11) =18581a(12) =22953a(13) =24577a(14) =31599a(15) =31697a(16) =38255a(17) =38621a(18) =42627a(19) =45643a(20) =46999a(21) =49185a(22) =52665a(23) =53557a(24) =55743a(25) =57929a(26) =60115a(27) =62301a(28) =66709a(29) =68859