a(n) = 625*n + 1.

Terms

a(0) =626a(1) =1251a(2) =1876a(3) =2501a(4) =3126a(5) =3751a(6) =4376a(7) =5001a(8) =5626a(9) =6251a(10) =6876a(11) =7501a(12) =8126a(13) =8751a(14) =9376a(15) =10001a(16) =10626a(17) =11251a(18) =11876a(19) =12501a(20) =13126a(21) =13751a(22) =14376a(23) =15001a(24) =15626a(25) =16251a(26) =16876a(27) =17501a(28) =18126a(29) =18751