A037645 Decimal expansion of a(n) is given by the first n terms of the periodic sequence with initial period 2,3,1.

2, 23, 231, 2312, 23123, 231231, 2312312, 23123123, 231231231, 2312312312, 23123123123, 231231231231, 2312312312312, 23123123123123, 231231231231231, 2312312312312312

Offset

1,1

Links

Table of n, a(n) for n=1..16.

Index entries for linear recurrences with constant coefficients, signature (10,0,1,-10).

Formula

G.f.: x*(x+2)*(1+x) / ( (x-1)*(10*x-1)*(1+x+x^2) ). - R. J. Mathar, Nov 21 2011

Crossrefs

Sequence in context: A037631 A026075 A037757 * A100893 A356557 A198972

Adjacent sequences: A037642 A037643 A037644 * A037646 A037647 A037648

Keyword

nonn,base,easy

Author

Clark Kimberling

Status

approved