The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A037617 Decimal expansion of a(n) is given by the first n terms of the periodic sequence with initial period 1,3,2. 6
1, 13, 132, 1321, 13213, 132132, 1321321, 13213213, 132132132, 1321321321, 13213213213, 132132132132, 1321321321321, 13213213213213, 132132132132132, 1321321321321321, 13213213213213213, 132132132132132132, 1321321321321321321, 13213213213213213213, 132132132132132132132 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
FORMULA
G.f.: x*(1+x)*(2*x+1) / ( (x-1)*(10*x-1)*(1+x+x^2) ). - R. J. Mathar, Aug 12 2013
a(n) ~ (44/333)*10^n = (44/333)*A011557(n). - Stefano Spezia, Oct 15 2023
MATHEMATICA
Table[FromDigits[PadRight[{}, n, {1, 3, 2}]], {n, 20}] (* Harvey P. Dale, Mar 29 2015 *)
CROSSREFS
Cf. A011557.
Sequence in context: A295349 A161498 A037715 * A295603 A199144 A198664
KEYWORD
nonn,base
AUTHOR
EXTENSIONS
a(17)-a(21) from Stefano Spezia, Oct 15 2023
STATUS
approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 30 18:48 EDT 2024. Contains 372974 sequences. (Running on oeis4.)