a(n) = n mod 5.

Terms

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