Rational 2-isogeny partner of curve #5011: https://elliptic-rank.icarm.cloud/curve/5011. Starting from the congruent-number curve y^2 = x^3 - 41^2*x, apply the standard 2-isogeny y^2 = x^3 + A*x -> y^2 = x^3 - 4*A*x. The submitted points are the exact images of (-9,120) and (841,24360) under (x,y) -> (y^2/x^2, y*(A-x^2)/x^2). Source curve credited to David Renshaw, found in an exhaustive ellrank scan of squarefree n <= 20000.
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