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

 

Logo

Annual Appeal: Today, Nov 11 2014, is the 4th anniversary of the launch of the new OEIS web site. 70,000 sequences have been added in these four years, all edited by volunteers. Please make a donation (tax deductible in the US) to help keep the OEIS running.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A033175 n 3's followed by 1. 10
1, 31, 331, 3331, 33331, 333331, 3333331, 33333331, 333333331, 3333333331, 33333333331, 333333333331, 3333333333331, 33333333333331, 333333333333331, 3333333333333331, 33333333333333331, 333333333333333331 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

REFERENCES

F. Smarandache, Properties of numbers, University of Craiova, 1973

LINKS

Table of n, a(n) for n=0..17.

Eric Weisstein's World of Mathematics, 3

Index to sequences with linear recurrences with constant coefficients, signature (11,-10)

FORMULA

a(n) = (10^(n+1)-7)/3.

a(n) = 10*a(n-1)+21 (with a(0)=1) [From Vincenzo Librandi, Nov 17 2010]

G.f.: ( 1+20*x ) / ( (10*x-1)*(x-1) ). - R. J. Mathar, Aug 24 2011

MATHEMATICA

Table[FromDigits[PadLeft[{1}, n, 3]], {n, 20}] (* Harvey P. Dale, Feb 21 2013 *)

CROSSREFS

Cf. A051200.

Sequence in context: A029813 A138697 A186071 * A123568 A111675 A142495

Adjacent sequences:  A033172 A033173 A033174 * A033176 A033177 A033178

KEYWORD

nonn,easy

AUTHOR

Jan Jensen (dorul(AT)post6.tele.dk)

STATUS

approved

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

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

Last modified December 21 16:36 EST 2014. Contains 252324 sequences.