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A066159
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Numbers n such that 4n-1 divides (2n-1)! + 1.
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2
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2, 3, 5, 11, 12, 17, 20, 26, 32, 33, 41, 45, 48, 50, 57, 66, 87, 92, 96, 105, 108, 111, 120, 123, 126, 131, 141, 143, 150, 152, 155, 158, 171, 173, 182, 185, 186, 197, 206, 210, 216, 222, 237, 248, 255, 263, 272, 273, 281, 288, 297, 323, 330, 342
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OFFSET
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1,1
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LINKS
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MAPLE
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MATHEMATICA
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Select[Range@ 360, Divisible[(2 # - 1)! + 1, 4 # - 1] &] (* Michael De Vlieger, Dec 02 2015 *)
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PROG
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(PARI) { n=0; for (m=1, 10^9, if (frac(((2*m - 1)! + 1)/(4*m - 1)) == 0, write("b066159.txt", n++, " ", m); if (n==1000, return)) ) } \\ Harry J. Smith, Feb 03 2010
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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Reference into the Math Puzzles made more specific by R. J. Mathar, Feb 11 2010
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STATUS
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approved
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