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-b2	4.4.9909.1	21	21.1	21.1-b	\( \bigl[a^{2} - a - 2\) , \( a^{3} - 5 a - 2\) , \( a^{3} - a^{2} - 3 a + 1\) , \( 34 a^{3} + 12 a^{2} - 188 a - 186\) , \( 183 a^{3} + 62 a^{2} - 1009 a - 987\bigr] \)
21.1-c2	4.4.9909.1	21	21.1	21.1-c	\( \bigl[a^{3} - a^{2} - 4 a + 1\) , \( a^{3} - a^{2} - 4 a + 1\) , \( a + 1\) , \( 203 a^{3} + 99 a^{2} - 1170 a - 1195\) , \( -3273 a^{3} - 1665 a^{2} + 18781 a + 19343\bigr] \)