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Search: id:A124446
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| 1, 1, 1, 1, 1, 1, 3, 4, 1, 4, 5, 6, 3, 3, 2, 16, 4, 1, 9, 20, 6, 5, 11, 24, 1, 12, 1, 42, 7, 8, 15, 64, 10, 16, 6, 54, 9, 9, 6, 80, 10, 6, 21, 110, 2, 11, 23, 96, 3, 4, 8, 156, 13, 1, 10, 168, 18, 28, 29, 120, 15, 15, 6, 256, 24, 10, 33, 272, 22, 24, 35, 216, 18, 36, 2, 342, 30, 24, 39
(list; graph; listen)
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OFFSET
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1,7
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LINKS
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Leroy Quet, Home Page (listed in lieu of email address)
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EXAMPLE
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Those positive integers which are coprime to 8 and are <= 8/2, are 1 and 3. Those integers which are coprime to 8 and are between 8/2 and 8, are 5 and 7.
So a(8) = GCD(1+3,5+7) = GCD(4,12) = 4.
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MATHEMATICA
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f1[n_] := Plus @@ Select[Range[Floor[n/2]], GCD[ #, n] == 1 &]; f2[n_] := Plus @@ Select[Range[Ceiling[n/2], n], GCD[ #, n] == 1 &]; Table[GCD[f1[n], f2[n]], {n, 80}] (*Chandler*)
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CROSSREFS
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Cf. A066840, A124440, A124447.
Sequence in context: A087694 A010262 A105579 this_sequence A091542 A079529 A133779
Adjacent sequences: A124443 A124444 A124445 this_sequence A124447 A124448 A124449
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KEYWORD
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nonn
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AUTHOR
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Leroy Quet 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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