Repdigits which are also Harshad numbers.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =6a(6) =7a(7) =8a(8) =9a(9) =111a(10) =222a(11) =333a(12) =444a(13) =555a(14) =666a(15) =777a(16) =888a(17) =999a(18) =111111111a(19) =222222222a(20) =333333333a(21) =444444444a(22) =555555555a(23) =666666666a(24) =777777777a(25) =888888888a(26) =999999999