a(n) = (greatest base 5 digit of n) - (least base 5 digit of n).

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =1a(6) =0a(7) =1a(8) =2a(9) =3a(10) =2a(11) =1a(12) =0a(13) =1a(14) =2a(15) =3a(16) =2a(17) =1a(18) =0a(19) =1a(20) =4a(21) =3a(22) =2a(23) =1a(24) =0a(25) =1a(26) =1a(27) =2a(28) =3a(29) =4