a(n) = 100*n + 4.

Terms

a(0) =4a(1) =104a(2) =204a(3) =304a(4) =404a(5) =504a(6) =604a(7) =704a(8) =804a(9) =904a(10) =1004a(11) =1104a(12) =1204a(13) =1304a(14) =1404a(15) =1504a(16) =1604a(17) =1704a(18) =1804a(19) =1904a(20) =2004a(21) =2104a(22) =2204a(23) =2304a(24) =2404a(25) =2504a(26) =2604a(27) =2704a(28) =2804a(29) =2904