Concatenation of n and the sum of the digits of n.

Terms

a(0) =0a(1) =11a(2) =22a(3) =33a(4) =44a(5) =55a(6) =66a(7) =77a(8) =88a(9) =99a(10) =101a(11) =112a(12) =123a(13) =134a(14) =145a(15) =156a(16) =167a(17) =178a(18) =189a(19) =1910a(20) =202a(21) =213a(22) =224a(23) =235a(24) =246a(25) =257a(26) =268a(27) =279a(28) =2810a(29) =2911