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Search: id:A124444
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| A124444 |
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a(n) = LCM of the integers, from n/2 to n, which are coprime to n. |
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+0
2
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| 1, 1, 2, 3, 12, 5, 60, 35, 280, 63, 2520, 77, 27720, 1287, 8008, 6435, 720720, 2431, 12252240, 46189, 3695120, 440895, 232792560, 96577, 1070845776, 3900225, 2974571600, 5014575, 80313433200, 215441, 2329089562800, 31556720475
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OFFSET
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1,3
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EXAMPLE
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The integers which are >= 9/2 and are <= 9 and which are coprime to 9 are 5, 7 and 8. So a(9) = LCM(5,7,8) = 280.
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MATHEMATICA
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f[n_] := LCM @@ Select[Range[Ceiling[n/2], n], GCD[ #, n] == 1 &]; Table[f[n], {n, 33}] (*Chandler*)
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CROSSREFS
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Cf. A124443.
Adjacent sequences: A124441 A124442 A124443 this_sequence A124445 A124446 A124447
Sequence in context: A120487 A069220 A062957 this_sequence A038610 A056819 A124442
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KEYWORD
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nonn
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AUTHOR
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Leroy Quet (qq-quet(AT)mindspring.com), Nov 01 2006
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EXTENSIONS
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Extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Nov 12 2006
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