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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
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| The first 11 terms are the same as the least common multiples in A051539.
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MATHEMATICA
| Table[Denominator[Total[1/Range[1, 4n+1, 4]]], {n, 0, 20}]
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CROSSREFS
| Cf. A016813 (4n+1), A075136 (numerators), A051539 (lcm of 5, 9, 13, ..., 4n+1).
Sequence in context: A084095 A174495 A121414 * A051539 A007696 A090136
Adjacent sequences: A097325 A097326 A097327 * A097329 A097330 A097331
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KEYWORD
| easy,frac,nonn
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AUTHOR
| T. D. Noe (noe(AT)sspectra.com), Aug 04 2004
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