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Search: id:A163449
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| 1, 11, 1010, 100100, 10001000, 1000010000, 100000100000, 10000001000000, 1000000010000000, 100000000100000000, 10000000001000000000, 1000000000010000000000, 100000000000100000000000, 10000000000001000000000000, 1000000000000010000000000000
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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n >= 1 the digits are: a 1, (n-1) times 0, a 1, and (n-1) times 0.
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FORMULA
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a(n) = 10^(2n-1) + 10^(n-1) = A163664(n)/10 for n >= 1.
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CROSSREFS
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Sequence in context: A004656 A143016 A152577 this_sequence A127961 A127962 A006938
Adjacent sequences: A163446 A163447 A163448 this_sequence A163450 A163451 A163452
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KEYWORD
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nonn,base,easy
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AUTHOR
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Jaroslav Krizek (jaroslav.krizek(AT)atlas.cz), Jul 27 2009
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EXTENSIONS
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Edited by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 06 2009
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