

A137466


1 concatenated with n 21's.


1



1, 121, 12121, 1212121, 121212121, 12121212121, 1212121212121, 121212121212121, 12121212121212121, 1212121212121212121, 121212121212121212121, 12121212121212121212121, 1212121212121212121212121, 121212121212121212121212121, 12121212121212121212121212121
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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



