login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
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. - 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

PROG

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

CROSSREFS

Sequence in context: A037764 A037652 A037771 * A131586 A163475 A200142

Adjacent sequences:  A037656 A037657 A037658 * A037660 A037661 A037662

KEYWORD

nonn,base,easy

AUTHOR

Clark Kimberling

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 6 18:38 EDT 2021. Contains 343586 sequences. (Running on oeis4.)