Numbers k such that 2^k - 1 is divisible by (k-1).

Terms

a(0) =2a(1) =4a(2) =16a(3) =36a(4) =120a(5) =256a(6) =456a(7) =1296a(8) =2556a(9) =2704a(10) =3816a(11) =3856a(12) =4356a(13) =5544a(14) =6480a(15) =8008a(16) =9216a(17) =10440a(18) =10620a(19) =11952a(20) =16212a(21) =22896a(22) =23436a(23) =26320a(24) =26796a(25) =27840a(26) =28680a(27) =35208a(28) =43056a(29) =44100