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-a4	4.4.9909.1	21	21.1	21.1-a	\( \bigl[1\) , \( a\) , \( a^{2} - 2\) , \( -930 a^{3} + 1070 a^{2} + 4157 a - 2268\) , \( 17576 a^{3} - 21717 a^{2} - 80504 a + 44128\bigr] \)
21.1-d6	4.4.9909.1	21	21.1	21.1-d	\( \bigl[a^{3} - a^{2} - 3 a + 2\) , \( a^{3} - a^{2} - 5 a\) , \( a + 1\) , \( 36 a^{3} - 554 a^{2} - 426 a + 351\) , \( 660 a^{3} + 9720 a^{2} + 6098 a - 5674\bigr] \)