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A066981
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Number of residues of Lucas numbers modulo n.
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2
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1, 2, 3, 4, 4, 6, 7, 6, 9, 8, 7, 10, 12, 14, 7, 11, 16, 11, 12, 10, 13, 14, 19, 14, 12, 24, 27, 20, 10, 14, 19, 22, 17, 20, 13, 15, 28, 13, 24, 10, 19, 26, 33, 20, 17, 21, 15, 17, 37, 24, 31, 36, 44, 29, 16, 28, 29, 20, 37, 18, 28, 21, 33, 42, 16, 34, 51, 26, 33, 26, 44, 17, 56
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OFFSET
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1,2
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LINKS
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EXAMPLE
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a(15)=7, since Lucas numbers reduced modulo 15 are {1, 2, 3, 4, 7, 11, 14}.
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MATHEMATICA
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Table[Length[Union[Mod[LucasL[Range[500]], n]]], {n, 75}] (* Harvey P. Dale, Dec 17 2014 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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