login
This site is supported by donations to The OEIS Foundation.
Logo

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A037645 Decimal expansion of a(n) is given by the first n terms of the periodic sequence with initial period 2,3,1. 0
2, 23, 231, 2312, 23123, 231231, 2312312, 23123123, 231231231, 2312312312, 23123123123, 231231231231, 2312312312312, 23123123123123, 231231231231231, 2312312312312312 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

LINKS

Index to sequences with linear recurrences with constant coefficients, signature (10,0,1,-10)

FORMULA

a(n)=10*a(n-1)+(n mod 3)+1, with a(0)=0 [From Paolo P. Lava (paoloplava(AT)gmail.com), Jul 30 2009]

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

CROSSREFS

Sequence in context: A037631 A026075 A037757 * A100893 A198972 A065122

Adjacent sequences:  A037642 A037643 A037644 * A037646 A037647 A037648

KEYWORD

nonn,base

AUTHOR

Clark Kimberling (ck6(AT)evansville.edu)

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified February 16 17:48 EST 2012. Contains 205939 sequences.