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Search: id:A066575
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| A066575 |
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LCM of numbers m such that 1 <= m <= n, m has a common factor with n, but m does not divide n. |
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+0
1
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| 1, 1, 1, 1, 1, 4, 1, 6, 6, 24, 1, 360, 1, 120, 180, 420, 1, 1680, 1, 5040, 1260, 5040, 1, 55440, 60, 55440, 2520, 720720, 1, 10810800, 1, 360360, 83160, 1441440, 2100, 73513440, 1, 24504480, 1081080, 2327925600, 1, 1396755360, 1, 465585120
(list; graph; listen)
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OFFSET
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1,6
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EXAMPLE
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a(12) = 360 = LCM(8,9,10) as 8, 9 and 10 are the only numbers <= 12 which are not relatively prime to 12 nor do they divide 12.
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MAPLE
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for i from 1 to 100 do a := 1:for j from 1 to i do b := igcd(i, j); if(b>1 and b<j) then a := ilcm(a, j):end if:end do:c[i] := a; end do:q := seq(c[k], k=1..100);
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CROSSREFS
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Sequence in context: A008565 A021100 A021028 this_sequence A070251 A134234 A154905
Adjacent sequences: A066572 A066573 A066574 this_sequence A066576 A066577 A066578
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KEYWORD
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nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Dec 19 2001
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EXTENSIONS
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More terms from Sascha Kurz (sascha.kurz(AT)uni-bayreuth.de), Mar 23 2002
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