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Search: id:A014573
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| A014573 |
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Smallest k such that phi(x) = k has exactly n solutions. |
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+0
7
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| 3, 0, 1, 2, 4, 8, 12, 32, 36, 40, 24, 48, 160, 396, 2268, 704, 312, 72, 336, 216, 936, 144, 624, 1056, 1760, 360, 2560, 384, 288, 1320, 3696, 240, 768, 9000, 432, 7128, 4200, 480, 576, 1296, 1200, 15936, 3312, 3072, 3240, 864, 3120, 7344, 3888, 720, 1680
(list; graph; listen)
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OFFSET
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0,1
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COMMENT
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Carmichael conjectured that no term exists for n=1.
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REFERENCES
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M. Abramowitz and I. A. Stegun, eds., Handbook of Mathematical Functions, National Bureau of Standards Applied Math. Series 55, 1964 (and various reprintings), p. 840.
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LINKS
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M. Abramowitz and I. A. Stegun, eds., Handbook of Mathematical Functions, National Bureau of Standards, Applied Math. Series 55, Tenth Printing, 1972 [alternative scanned copy].
Eric Weisstein's World of Mathematics, Carmichael's Totient Function conjecture
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CROSSREFS
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Cf. A000010. Essentially same as A007374, which is the main entry for this sequence.
Sequence in context: A147755 A136748 A049765 this_sequence A067166 A125209 A071818
Adjacent sequences: A014570 A014571 A014572 this_sequence A014574 A014575 A014576
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KEYWORD
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nonn,easy
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AUTHOR
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Eric Weisstein (eric(AT)weisstein.com)
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EXTENSIONS
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Link fixed by Charles R Greathouse IV (charles.greathouse(AT)case.edu), Oct 06 2009
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