A008619(n-1)-fold concatenation of A109613(n).

A180116

A008619(n-1)-fold concatenation of A109613(n).

Terms

    a(0) =1a(1) =3a(2) =33a(3) =55a(4) =555a(5) =777a(6) =7777a(7) =9999a(8) =99999a(9) =1111111111a(10) =111111111111a(11) =131313131313

External references