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A097328
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Denominator of 1 + 1/5 + 1/9 +...+ 1/(4n+1).
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1
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1, 5, 45, 585, 9945, 69615, 348075, 10094175, 111035925, 4108329225, 168441498225, 56147166075, 393030162525, 20830598613825, 395781373662675, 24142663793423175, 24142663793423175, 555281267248733025
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OFFSET
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0,2
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COMMENTS
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The first 11 terms are the same as the least common multiples in A051539.
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LINKS
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MATHEMATICA
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Table[Denominator[Total[1/Range[1, 4n+1, 4]]], {n, 0, 20}]
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CROSSREFS
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KEYWORD
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easy,frac,nonn
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AUTHOR
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STATUS
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approved
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