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 A097328 Denominator of 1 + 1/5 + 1/9 +...+ 1/(4n+1). 1
 1, 5, 45, 585, 9945, 69615, 348075, 10094175, 111035925, 4108329225, 168441498225, 56147166075, 393030162525, 20830598613825, 395781373662675, 24142663793423175, 24142663793423175, 555281267248733025 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS The first 11 terms are the same as the least common multiples in A051539. LINKS MATHEMATICA Table[Denominator[Total[1/Range[1, 4n+1, 4]]], {n, 0, 20}] CROSSREFS Cf. A016813 (4n+1), A075136 (numerators), A051539 (lcm of 5, 9, 13, ..., 4n+1). Sequence in context: A174495 A121414 A243678 * A051539 A007696 A090136 Adjacent sequences: A097325 A097326 A097327 * A097329 A097330 A097331 KEYWORD easy,frac,nonn AUTHOR T. D. Noe, Aug 04 2004 STATUS approved

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Last modified November 30 21:57 EST 2022. Contains 358453 sequences. (Running on oeis4.)