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-b1	4.4.9909.1	21	21.1	21.1-b	\( \bigl[a^{2} - a - 2\) , \( a^{3} - 5 a - 2\) , \( a^{3} - a^{2} - 3 a + 1\) , \( 54 a^{3} + 37 a^{2} - 318 a - 386\) , \( -269 a^{3} - 197 a^{2} + 1611 a + 1838\bigr] \)
21.1-c1	4.4.9909.1	21	21.1	21.1-c	\( \bigl[a\) , \( a^{2} - a - 4\) , \( a^{3} - 5 a - 2\) , \( 247 a^{3} - 369 a^{2} - 783 a + 29\) , \( -2748 a^{3} + 5314 a^{2} + 6231 a - 5064\bigr] \)