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A110430
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Arithmetic mean of all n-digit positive even numbers.
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2
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5, 54, 549, 5499, 54999, 549999, 5499999, 54999999, 549999999, 5499999999, 54999999999, 549999999999, 5499999999999, 54999999999999, 549999999999999, 5499999999999999, 54999999999999999, 549999999999999999, 5499999999999999999
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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FORMULA
| a(n) =1/2{10^(n-1) + 10^n -2}
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EXAMPLE
| a(2) = Arithmetic mean of 10,12,14,...96,98 =(10 + 98)/2 =54.
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CROSSREFS
| Sequence in context: A093674 A129664 A087125 * A110432 A132619 A085719
Adjacent sequences: A110427 A110428 A110429 * A110431 A110432 A110433
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KEYWORD
| base,easy,nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Aug 02 2005
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EXTENSIONS
| Corrected and extended by Joshua Zucker (joshua.zucker(AT)stanfordalumni.org), May 10 2006
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