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

 

Logo

Invitation: celebrating 50 years of OEIS, 250000 sequences, and Sloane's 75th, there will be a conference at DIMACS, Rutgers, Oct 9-10 2014.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A137466 1 concatenated with n 21's. 1
1, 121, 12121, 1212121, 121212121, 12121212121, 1212121212121, 121212121212121, 12121212121212121, 1212121212121212121, 121212121212121212121, 12121212121212121212121, 1212121212121212121212121, 121212121212121212121212121, 12121212121212121212121212121 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..100

FORMULA

a(n) = a(0)*100^n +(7/33)*(100^n) -1

EXAMPLE

a(7) = 1 21 21 21 21 21 21 21

MATHEMATICA

Table[FromDigits[PadRight[{1}, n, {1, 2}]], {n, 1, 31, 2}] (* or *) LinearRecurrence[{101, -100}, {1, 121}, 30] (* Harvey P. Dale, Aug 17 2013 *)

CROSSREFS

Sequence in context: A054319 A006061 A079215 * A062689 A057139 A002477

Adjacent sequences:  A137463 A137464 A137465 * A137467 A137468 A137469

KEYWORD

easy,nonn,base

AUTHOR

Ctibor O. Zizka, Apr 19 2008

EXTENSIONS

More terms from Harvey P. Dale, Aug 17 2013

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 August 31 02:32 EDT 2014. Contains 246235 sequences.