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A165402
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a(n) = (10^n*2-11)/9
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0
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1, 21, 221, 2221, 22221, 222221, 2222221, 22222221, 222222221, 2222222221, 22222222221, 222222222221, 2222222222221, 22222222222221, 222222222222221, 2222222222222221, 22222222222222221, 222222222222222221
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OFFSET
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1,2
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COMMENTS
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a(n) are also n-1 twos followed by a one.
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LINKS
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Table of n, a(n) for n=1..18.
Markus Tervooren, Factorizations of (2)w1
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MATHEMATICA
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Table[FromDigits[PadLeft[{1}, n, 2]], {n, 20}] (* or *) (2*10^Range[20]-11)/9 (* From Harvey P. Dale, Aug 10 2011 *)
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CROSSREFS
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Sequence in context: A152161 A008421 A134585 * A135120 A027812 A171112
Adjacent sequences: A165399 A165400 A165401 * A165403 A165404 A165405
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KEYWORD
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easy,nonn
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AUTHOR
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Ivan Panchenko, Sep 17 2009
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STATUS
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approved
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