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

A037589

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

Terms

    a(0) =3a(1) =31a(2) =313a(3) =3131a(4) =31313a(5) =313131a(6) =3131313a(7) =31313131a(8) =313131313a(9) =3131313131a(10) =31313131313a(11) =313131313131

External references