Decimal expansion of a(n) is given by the first n terms of the periodic sequence with initial period 1,3,0.

A037603

Decimal expansion of a(n) is given by the first n terms of the periodic sequence with initial period 1,3,0.

Terms

    a(0) =1a(1) =13a(2) =130a(3) =1301a(4) =13013a(5) =130130a(6) =1301301a(7) =13013013a(8) =130130130a(9) =1301301301a(10) =13013013013a(11) =130130130130

External references