A037631 Decimal expansion of a(n) is given by the first n terms of the periodic sequence with initial period 2,3,0.

2, 23, 230, 2302, 23023, 230230, 2302302, 23023023, 230230230, 2302302302, 23023023023, 230230230230, 2302302302302, 23023023023023, 230230230230230, 2302302302302302

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

Mathematica

Table[FromDigits[PadRight[{}, n, {2, 3, 0}]], {n, 20}] (* or *) LinearRecurrence[{10, 0, 1, -10}, {2, 23, 230, 2302}, 20] (* Harvey P. Dale, Jul 03 2024 *)

Prog

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

Crossrefs

Sequence in context: A083808 A252016 A037750 * A026075 A037757 A037645

Adjacent sequences: A037628 A037629 A037630 * A037632 A037633 A037634

Keyword

nonn,base,easy

Author

Clark Kimberling

Status

approved