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A028939
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Denominator of y coordinate of (2n)*P where P is generator for rational points on curve y^2+y = x^3-x.
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2
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1, 1, 1, 125, 64, 24389, 2146689, 274625, 50202571769, 4302115807744, 1469451780501769, 13528653463047586625, 343216282443844010111, 63061816101171948456692661, 495133617181351428873673516736
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OFFSET
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1,4
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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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LINKS
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Table of n, a(n) for n=1..15.
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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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8P = (21/25, -69/125).
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CROSSREFS
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Sequence in context: A077495 A030668 A030678 * A195420 A080538 A104233
Adjacent sequences: A028936 A028937 A028938 * A028940 A028941 A028942
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane.
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STATUS
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approved
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