Elliptic Curve Search Results

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Base field	Conductor norm	Isogenous curves	Base change curves	\(\Q\)-curves	CM curves
Torsion order	Isogeny degree	Torsion structure	j-invariant

Results (displaying both matches)

Label	Base field	Conductor norm	Conductor label	Isogeny class	Weierstrass coefficients
21.1-a2	4.4.9909.1	21	21.1	21.1-a	\( \bigl[1\) , \( a\) , \( a^{2} - 2\) , \( -13750 a^{3} + 16600 a^{2} + 62447 a - 34158\) , \( 1313070 a^{3} - 1585569 a^{2} - 5963840 a + 3262240\bigr] \)
21.1-d4	4.4.9909.1	21	21.1	21.1-d	\( \bigl[a^{3} - a^{2} - 3 a + 2\) , \( a^{3} - a^{2} - 5 a\) , \( a + 1\) , \( -34 a^{3} + 6 a^{2} + 144 a - 69\) , \( -240 a^{3} + 410 a^{2} + 1244 a - 706\bigr] \)