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A051539
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Least common multiple of {1, 5, 9, 13, 17 ...,(4n+1)} (A016813).
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9
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1, 5, 45, 585, 9945, 69615, 348075, 10094175, 111035925, 4108329225, 168441498225, 168441498225, 1179090487575, 62491795841475, 1187344120988025, 72427991380269525, 72427991380269525, 1665843801746199075, 121606597527472532475, 121606597527472532475
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| This sequence coincides with sequence A097328 of denominators of 1+1/5+1/9+1/13+...+1/(4n+1) iff n<12. - T. D. Noe (noe(AT)sspectra.com), Aug 04 2004
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LINKS
| T. D. Noe, Table of n, a(n) for n=0..200
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EXAMPLE
| a(3) = LCM {1, 5, 9, 13} = 585
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MATHEMATICA
| Table[ Apply[ LCM, Join[{1}, Table[1 + 4i, {i, 0, n}]]], {n, 0, 19}]
nn=20; Table[LCM@@Take[4Range[0, nn-1]+1, n], {n, nn}] (* From Harvey P. Dale, July 04 2011 *)
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PROG
| (MAGMA) k:=77; [Lcm([h: h in [1..j by 4]]): j in [1..k by 4]]; // Bruno Berselli, May 03 2011
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CROSSREFS
| Cf. A016813, A075136, A074598.
Cf. A097329.
Sequence in context: A174495 A121414 A097328 * A007696 A090136 A090356
Adjacent sequences: A051536 A051537 A051538 * A051540 A051541 A051542
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KEYWORD
| easy,nice,nonn
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AUTHOR
| Asher Auel (asher.auel(AT)reed.edu)
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EXTENSIONS
| Edited by Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 27 2002
a(16) corrected by T. D. Noe, Feb 08 2008
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