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Search: id:A028944
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| A028944 |
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Numerator of X-coordinate of 2n*P where P is generator for rational points on curve y^2+y = x^3-x. |
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+0
1
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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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REFERENCES
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B. Mazur, Arithmetic on curves, Bull. Amer Math. Soc. 14 (1986), 207-259; see p 225.
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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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CROSSREFS
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Adjacent sequences: A028941 A028942 A028943 this_sequence A028945 A028946 A028947
Sequence in context: A137961 A020039 A117736 this_sequence A054720 A110373 A081067
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KEYWORD
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sign
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AUTHOR
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njas
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