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A037659 Decimal expansion of a(n) is given by the first n terms of the periodic sequence with initial period 3,0,2. 0
3, 30, 302, 3023, 30230, 302302, 3023023, 30230230, 302302302, 3023023023, 30230230230, 302302302302, 3023023023023, 30230230230230, 302302302302302, 3023023023023023 (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)*{-(n mod 3)+14*[(n+1) mod 3]+2*[(n+2) mod 3]}, with a(0)=0 [From Paolo P. Lava, Jul 30 2009]

G.f. x*(3+2*x^2) / ( (x-1)*(10*x-1)*(1+x+x^2) ). - R. J. Mathar, Aug 04 2013

CROSSREFS

Sequence in context: A037764 A037652 A037771 * A131586 A163475 A200142

Adjacent sequences:  A037656 A037657 A037658 * A037660 A037661 A037662

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified May 19 02:29 EDT 2019. Contains 323377 sequences. (Running on oeis4.)