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Curve Isogeny class
LMFDB label Cremona label LMFDB label Cremona label Weierstrass coefficients Rank Torsion structure
21.a1 21a5 21.a 21a $[1, 0, 0, -784, -8515]$ $0$ $[2]$
21.a2 21a2 21.a 21a $[1, 0, 0, -49, -136]$ $0$ $[2, 2]$
21.a3 21a3 21.a 21a $[1, 0, 0, -39, 90]$ $0$ $[8]$
21.a4 21a6 21.a 21a $[1, 0, 0, -34, -217]$ $0$ $[2]$
21.a5 21a1 21.a 21a $[1, 0, 0, -4, -1]$ $0$ $[2, 4]$
21.a6 21a4 21.a 21a $[1, 0, 0, 1, 0]$ $0$ $[4]$
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