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A051426
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Least common multiple of {2, 4, 6, ..., 2n}.
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4
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2, 4, 12, 24, 120, 120, 840, 1680, 5040, 5040, 55440, 55440, 720720, 720720, 720720, 1441440, 24504480, 24504480, 465585120, 465585120, 465585120, 465585120, 10708457760, 10708457760, 53542288800, 53542288800, 160626866400, 160626866400, 4658179125600
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OFFSET
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1,1
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COMMENTS
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REFERENCES
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A. Murthy, Some new Smarandache sequences, functions and partitions, Smarandache Notions Journal Vol. 11 N. 1-2-3 Spring 2000 (but beware errors).
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LINKS
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FORMULA
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EXAMPLE
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a(3) = lcm{2,4,6} = 12;
a(7) = lcm{2,4,6,8,10,12,14} = 840.
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MATHEMATICA
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SZ={2}; n=2; L=2; Do[L=LCM[L, 2n]; AppendTo[SZ, L]; n++, {99}]; SZ (* Zak Seidov, Aug 01 2009 *)
Table[LCM@@Range[2, 2n, 2], {n, 30}] (* Harvey P. Dale, Oct 09 2011 *)
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PROG
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(Haskell)
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CROSSREFS
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KEYWORD
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easy,nice,nonn
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AUTHOR
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EXTENSIONS
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a(6), a(7) and a(8) corrected by T. D. Noe, Feb 08 2008
Corrected the example, which did not reflect the sequence values provided. - Michael Davies (mykdavies+oeis(AT)gmail.com), Oct 10 2008
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STATUS
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approved
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