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A086165
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Card{ (x,y,z) | x<y<z and LCM(x,y,z)=n } where LCM(x,y,z) denote the least common multiple of (x,y,z).
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2
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0, 0, 0, 1, 0, 4, 0, 3, 1, 4, 0, 15, 0, 4, 4, 6, 0, 15, 0, 15, 4, 4, 0, 33, 1, 4, 3, 15, 0, 44, 0, 10, 4, 4, 4, 48, 0, 4, 4, 33, 0, 44, 0, 15, 15, 4, 0, 58, 1, 15, 4, 15, 0, 33, 4, 33, 4, 4, 0, 133, 0, 4, 15, 15, 4, 44, 0, 15, 4, 44, 0, 100, 0, 4, 15, 15, 4, 44, 0, 58, 6, 4, 0, 133, 4, 4, 4, 33, 0
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,6
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FORMULA
| a(n) = (A070919(n)-3*A048691(n)+2)/6. - Vladeta Jovovic (vladeta(AT)eunet.rs), Dec 01 2004
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MAPLE
| for n from 1 to 100 do a[n] := 0:for x from 1 to n do for y from x+1 to n do for z from y+1 to n do if(lcm(x, y, z)=n) then a[n] := a[n]+1:fi:od:od:od:od:seq(a[j], j=1..200); (from Sascha Kurz)
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CROSSREFS
| Cf. A086222.
Sequence in context: A200682 A156788 A130801 * A096303 A021252 A195775
Adjacent sequences: A086162 A086163 A086164 * A086166 A086167 A086168
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KEYWORD
| nonn
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AUTHOR
| Yuval Dekel (dekelyuval(AT)hotmail.com), Sep 13 2003
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EXTENSIONS
| More terms from Sascha Kurz (sascha.kurz(AT)uni-bayreuth.de), Sep 22 2003
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