Positive numbers m such that m^2 - 1 divides 4^m - 1.

Terms

a(0) =2a(1) =4a(2) =6a(3) =16a(4) =36a(5) =52a(6) =66a(7) =256a(8) =378a(9) =456a(10) =1296a(11) =1470a(12) =1548a(13) =1800a(14) =2002a(15) =2556a(16) =4356a(17) =6480a(18) =8008a(19) =11952a(20) =23580a(21) =26320a(22) =33930a(23) =36636a(24) =37170a(25) =43290a(26) =44100a(27) =47520a(28) =47880a(29) =49680