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A085047
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a(n) is the least number not already used such that the arithmetic mean of the first n terms is a square.
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0
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1, 7, 4, 24, 9, 51, 16, 88, 25, 135, 36, 192, 49, 259, 64, 336, 81, 423, 100, 520, 121, 627, 144, 744, 169, 871, 196, 1008, 225, 1155, 256, 1312, 289, 1479, 324, 1656, 361, 1843, 400, 2040, 441, 2247, 484, 2464, 529, 2691, 576, 2928, 625, 3175, 676, 3432, 729
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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FORMULA
| a(2n-1) = n^2, a(2n) = n*(5n+2).
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EXAMPLE
| {a(1) +a(2) +a(3) +a(4) +a(5)}/5 = (1+7+4+24+9)/5 = 9= 3^2.
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CROSSREFS
| Sequence in context: A063632 A147601 A075536 * A070427 A140721 A038270
Adjacent sequences: A085044 A085045 A085046 * A085048 A085049 A085050
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KEYWORD
| nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jun 20 2003
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EXTENSIONS
| More terms from David Wasserman (wasserma(AT)spawar.navy.mil), Jan 11 2005
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