Cremona's table of elliptic curves

420 = 2² · 3 · 5 · 7

Class	r	Atkin-Lehner	Eigenvalues
420a (2 curves)	0	2- 3+ 5+ 7+	2- 3+ 5+ 7+  2  4  6  6
Curve Equation t 420a1 [0,-1,0,-4061,67590] 2 420a2 [0,-1,0,11564,448840] 2
420b (2 curves)	0	2- 3+ 5- 7-	2- 3+ 5- 7- -2  4  2  2
Curve Equation t 420b1 [0,-1,0,-565,5362] 2 420b2 [0,-1,0,-540,5832] 2
420c (4 curves)	0	2- 3- 5+ 7-	2- 3- 5+ 7-  6 -4  6  2
Curve Equation t 420c1 [0,1,0,-61,164] 6 420c2 [0,1,0,-36,324] 6 420c3 [0,1,0,-301,-1960] 2 420c4 [0,1,0,324,-8460] 2
420d (2 curves)	0	2- 3- 5- 7+	2- 3- 5- 7+  2  4  2 -2
Curve Equation t 420d1 [0,1,0,-5,0] 2 420d2 [0,1,0,20,20] 2

Data from Elliptic Curve Data by J. E. Cremona.
Design inspired by The Modular Forms Explorer by William Stein.

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