Period 2: repeat (2,5).

Terms

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