A037729 Decimal expansion of a(n) is given by the first n terms of the periodic sequence with initial period 2,0,3,1.

2, 20, 203, 2031, 20312, 203120, 2031203, 20312031, 203120312, 2031203120, 20312031203, 203120312031, 2031203120312, 20312031203120, 203120312031203, 2031203120312031

Offset

1,1

Links

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

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

Formula

G.f.: x*(2+3*x^2+x^3) / ( (x-1)*(10*x-1)*(1+x)*(x^2+1) ). - R. J. Mathar, Nov 21 2011

Prog

(PARI) Vec(x*(2+3*x^2+x^3)/((x-1)*(10*x-1)*(1+x)*(x^2+1)) + O(x^25)) \\ Jinyuan Wang, Apr 14 2020

Crossrefs

Sequence in context: A037519 A037722 A109107 * A037624 A077327 A173499

Adjacent sequences: A037726 A037727 A037728 * A037730 A037731 A037732

Keyword

nonn,base,easy

Author

Clark Kimberling

Status

approved