Numbers k such that 2k-1 divides 2^k-1.

Terms

a(0) =1a(1) =2a(2) =8a(3) =128a(4) =228a(5) =648a(6) =1352a(7) =1908a(8) =3240a(9) =4608a(10) =5220a(11) =5976a(12) =11448a(13) =13160a(14) =13920a(15) =21528a(16) =22050a(17) =23760a(18) =23940a(19) =24840a(20) =30960a(21) =31284a(22) =31584a(23) =31968a(24) =32768a(25) =37224a(26) =46092a(27) =46512a(28) =47268a(29) =60480