Final digit of prime(n).

Terms

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