Numbers k such that 2*k + 1 divides 2^(k+1) - 1.

Terms

a(0) =0a(1) =1a(2) =7a(3) =127a(4) =227a(5) =647a(6) =1351a(7) =1907a(8) =3239a(9) =4607a(10) =5219a(11) =5975a(12) =11447a(13) =13159a(14) =13919a(15) =21527a(16) =22049a(17) =23759a(18) =23939a(19) =24839a(20) =30959a(21) =31283a(22) =31583a(23) =31967a(24) =32767a(25) =37223a(26) =46091a(27) =46511a(28) =47267a(29) =60479