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Search: id:A002279
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| 0, 5, 55, 555, 5555, 55555, 555555, 5555555, 55555555, 555555555, 5555555555, 55555555555, 555555555555, 5555555555555, 55555555555555, 555555555555555, 5555555555555555, 55555555555555555
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OFFSET
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0,2
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COMMENT
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Arithmetic mean of all n-digit odd numbers. E.g. a(2) = A.M. of {11,13,15,...97,99} = (11+99)/2 =55. - Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Aug 02 2005
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FORMULA
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a(n)=10*a(n-1)+5, with a(0)=0 [From Paolo P. Lava (ppl(AT)spl.at), Jan 23 2009]
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CROSSREFS
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Sequence in context: A045640 A043040 A062183 this_sequence A119292 A139258 A102312
Adjacent sequences: A002276 A002277 A002278 this_sequence A002280 A002281 A002282
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KEYWORD
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easy,nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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