a(n) = 1000*n - 20.

Terms

a(0) =980a(1) =1980a(2) =2980a(3) =3980a(4) =4980a(5) =5980a(6) =6980a(7) =7980a(8) =8980a(9) =9980a(10) =10980a(11) =11980a(12) =12980a(13) =13980a(14) =14980a(15) =15980a(16) =16980a(17) =17980a(18) =18980a(19) =19980a(20) =20980a(21) =21980a(22) =22980a(23) =23980a(24) =24980a(25) =25980a(26) =26980a(27) =27980a(28) =28980a(29) =29980