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A137465
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1 concatenated with n n's concatenated with 1.
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0
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111, 1221, 13331, 144441, 1555551, 16666661, 177777771, 1888888881, 19999999991, 1101010101010101010101, 111111111111111111111111, 11212121212121212121212121, 1131313131313131313131313131, 114141414141414141414141414141, 11515151515151515151515151515151
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refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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LINKS
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EXAMPLE
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a(7) = 177777771.
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MATHEMATICA
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Table[FromDigits[Join[{1}, Flatten[IntegerDigits/@Table[n, {n}]], {1}]], {n, 15}] (* Harvey P. Dale, Apr 19 2013 *)
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CROSSREFS
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Cf. A000461 (concatenate n n times).
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KEYWORD
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easy,nonn,base
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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