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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

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Last modified December 20 18:46 EST 2014. Contains 252288 sequences.