Numbers of the form i*5^j-1 (i=1..4, j >= 0).

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =4a(5) =9a(6) =14a(7) =19a(8) =24a(9) =49a(10) =74a(11) =99a(12) =124a(13) =249a(14) =374a(15) =499a(16) =624a(17) =1249a(18) =1874a(19) =2499a(20) =3124a(21) =6249a(22) =9374a(23) =12499a(24) =15624a(25) =31249a(26) =46874a(27) =62499a(28) =78124a(29) =156249