login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 59th year, we have over 358,000 sequences, and we’ve crossed 10,300 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
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

Table of n, a(n) for n=0..17.

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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

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