Elliptic curves over $\Q$ of Conductor 21

Conductor	j-invariant	Rank	Torsion order	Torsion structure
Analytic order of Ш	Cyclic isogeny degree	Maximal primes	Non-max. $p$	Bad $p$
Number of integral points	Regulator	CM	CM discriminant	Semistable
Curves per isogeny class

Results (displaying all 6 matches)

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]