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Rational 3-isogeny partner of ICARM curve #5408: https://elliptic-rank.icarm.cloud/curve/5408 The source curve was submitted by Daniel Błażewicz. Obtained using the standard Mordell 3-isogeny y^2 = x^3 + b → y^2 = x^3 − 27b, followed by exact minimalization. The seven source points were mapped through the isogeny and checked exactly. PARI/GP 2.17.4 returned rank bounds [7,7], trivial rational torsion, conductor 38943333721147716 and minimal discriminant -22898680228034857008. Exact quadratic-character certification at 15 good primes gives an F_2 matrix of rank 7, proving the seven submitted points independent.