Numbers of the form i*6^j-1 (i=1..5, j >= 0).

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =4a(5) =5a(6) =11a(7) =17a(8) =23a(9) =29a(10) =35a(11) =71a(12) =107a(13) =143a(14) =179a(15) =215a(16) =431a(17) =647a(18) =863a(19) =1079a(20) =1295a(21) =2591a(22) =3887a(23) =5183a(24) =6479a(25) =7775a(26) =15551a(27) =23327a(28) =31103a(29) =38879