Cremona's table of elliptic curves
Conductor 21
21 = 3 · 7
Isogeny classes of curves of conductor 21
[newforms of level 21]
Class
r
Atkin-Lehner
Eigenvalues
21a
(6 curves)
0
3
-
7
+
-1
3
-
-2
7
+
4
-2
-6
4
Curve
Equation
t
21a1
[1,0,0,-4,-1]
8
21a2
[1,0,0,-49,-136]
4
21a3
[1,0,0,-39,90]
8
21a4
[1,0,0,1,0]
4
21a5
[1,0,0,-784,-8515]
2
21a6
[1,0,0,-34,-217]
2
Data from
Elliptic Curve Data
by J. E. Cremona.
Design inspired by
The Modular Forms Explorer
by William Stein.
Part of
Computational Number Theory
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