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A137466 1 concatenated with n 21's. 0
1, 121, 12121, 1212121, 121212121, 12121212121, 1212121212121, 121212121212121, 12121212121212121 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

FORMULA

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

EXAMPLE

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

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 (ctibor.zizka(AT)seznam.cz), Apr 19 2008

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Last modified February 15 03:11 EST 2012. Contains 205694 sequences.