a(n) = 1000*n + 20.

Terms

a(0) =1020a(1) =2020a(2) =3020a(3) =4020a(4) =5020a(5) =6020a(6) =7020a(7) =8020a(8) =9020a(9) =10020a(10) =11020a(11) =12020a(12) =13020a(13) =14020a(14) =15020a(15) =16020a(16) =17020a(17) =18020a(18) =19020a(19) =20020a(20) =21020a(21) =22020a(22) =23020a(23) =24020a(24) =25020a(25) =26020a(26) =27020a(27) =28020a(28) =29020a(29) =30020