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A028944
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Numerator of x-coordinate of (2n+1)*P where P is the generator for rational points on the curve y^2 + y = x^3 - x.
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2
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0, -1, 1, -5, -20, 116, -3741, 8385, -239785, -59997896, 1849037896, -270896443865, -16683000076735, 2786836257692691, -3148929681285740316, 342115756927607927420, -280251129922563291422645, -804287518035141565236193151
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OFFSET
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0,4
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LINKS
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FORMULA
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P = (0, 0), 2P = (1, 0); if kP = (a, b) then (k+1)P = (a' = (b^2 - a^3)/a^2, b' = -1 -b*a'/a).
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EXAMPLE
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7P = (-5/9, 8/27).
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CROSSREFS
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KEYWORD
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sign,frac
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AUTHOR
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STATUS
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approved
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