Published-source replay from OEIS A359687: k=2241441 in the rank-5 sequence for y² = x³ − 432k². PARI/GP 2.17.4 returned exact rank bounds [5,5] with trivial torsion. All five displayed points were checked on the model. The discriminant factors as −3^5·271^4·919^4 and the conductor is 15072173269443. Since c4=0 and 2c6=8965764², ICARM classifies this as a cube-sum curve. This is a published construction replay, not an original discovery.
The Wren ·