Numbers beginning and ending with their multiplicative digital root.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =6a(6) =7a(7) =8a(8) =9a(9) =11a(10) =88a(11) =111a(12) =232a(13) =535a(14) =575a(15) =646a(16) =686a(17) =818a(18) =838a(19) =1111a(20) =2132a(21) =2312a(22) =2472a(23) =2692a(24) =2742a(25) =2962a(26) =5135a(27) =5175a(28) =5315a(29) =5715