Numbers of the form i*8^j-1 (i=1..7, j >= 0).

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =4a(5) =5a(6) =6a(7) =7a(8) =15a(9) =23a(10) =31a(11) =39a(12) =47a(13) =55a(14) =63a(15) =127a(16) =191a(17) =255a(18) =319a(19) =383a(20) =447a(21) =511a(22) =1023a(23) =1535a(24) =2047a(25) =2559a(26) =3071a(27) =3583a(28) =4095a(29) =8191