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A137465
1 concatenated with n n's concatenated with 1.
0
111, 1221, 13331, 144441, 1555551, 16666661, 177777771, 1888888881, 19999999991, 1101010101010101010101, 111111111111111111111111, 11212121212121212121212121, 1131313131313131313131313131, 114141414141414141414141414141, 11515151515151515151515151515151
OFFSET
1,1
EXAMPLE
a(7) = 177777771.
MATHEMATICA
Table[FromDigits[Join[{1}, Flatten[IntegerDigits/@Table[n, {n}]], {1}]], {n, 15}] (* Harvey P. Dale, Apr 19 2013 *)
CROSSREFS
Cf. A000461 (concatenate n n times).
Sequence in context: A102782 A302475 A303256 * A101152 A250145 A075859
KEYWORD
easy,nonn,base
AUTHOR
Ctibor O. Zizka, Apr 19 2008
EXTENSIONS
More terms from Harvey P. Dale, Apr 19 2013
STATUS
approved