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A037631 Decimal expansion of a(n) is given by the first n terms of the periodic sequence with initial period 2,3,0. 0
2, 23, 230, 2302, 23023, 230230, 2302302, 23023023, 230230230, 2302302302, 23023023023, 230230230230, 2302302302302, 23023023023023, 230230230230230, 2302302302302302 (list; graph; refs; listen; history; text; internal format)
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

a(n) = 10*a(n-1) + (1/9)*(14*(n mod 3) + 2*((n+1) mod 3) - ((n+2) mod 3)), with a(0)=0. - Paolo P. Lava, Jul 30 2009

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

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

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Last modified May 23 07:54 EDT 2022. Contains 353961 sequences. (Running on oeis4.)