The initial decimal digits of 2^a(n) are the decimal digits of n followed by n.

Terms

a(0) =50a(1) =51a(2) =25a(3) =145a(4) =142a(5) =119a(6) =86a(7) =239a(8) =93a(9) =1558a(10) =1598a(11) =761a(12) =1183a(13) =6651a(14) =5515a(15) =4183a(16) =34a(17) =8990a(18) =1343a(19) =4180a(20) =7987a(21) =10628a(22) =938a(23) =5519a(24) =4177a(25) =10213a(26) =10326a(27) =6652a(28) =1327a(29) =5516