Cremona's table of elliptic curves

4221 = 3² · 7 · 67

Class	r	Atkin-Lehner	Eigenvalues
4221a (1 curve)	0	3- 7+ 67+	1 3- -1 7+  0  3  0 -4
Curve Equation t 4221a1 [1,-1,0,-105,-388] 1
4221b (1 curve)	0	3- 7+ 67+	-1 3-  3 7+  0 -1  8  8
Curve Equation t 4221b1 [1,-1,1,-716,7418] 1
4221c (1 curve)	0	3- 7+ 67+	-2 3- -4 7+  2  4  3  7
Curve Equation t 4221c1 [0,0,1,-35517,-2578464] 1
4221d (4 curves)	1	3- 7+ 67-	1 3- -2 7+  4  2  6 -8
Curve Equation t Generators 4221d1 [1,-1,0,33417,1716336] 2 [38342:2636977:8] 4221d2 [1,-1,0,-168588,15412275] 4 [188702278:12932804849:39304] 4221d3 [1,-1,0,-1202733,-496489500] 2 [-1807912381906241412648:-7887367366043953548291:2766783085774636544] 4221d4 [1,-1,0,-2366523,1401430086] 2 [299250:28008:343]
4221e (2 curves)	1	3- 7+ 67-	1 3- -4 7+  4  4 -2  2
Curve Equation t Generators 4221e1 [1,-1,0,-189,1264] 2 [20:62:1] 4221e2 [1,-1,0,-3204,70609] 2 [32:-7:1]
4221f (1 curve)	1	3- 7- 67+	0 3-  2 7-  0  0 -1 -3
Curve Equation t Generators 4221f1 [0,0,1,-264,-1782] 1 [26:94:1]
4221g (2 curves)	1	3- 7- 67+	-1 3-  0 7-  4 -4  6 -2
Curve Equation t Generators 4221g1 [1,-1,1,-95,2126] 2 [-6:52:1] 4221g2 [1,-1,1,-3110,67250] 2 [-30:379:1]
4221h (1 curve)	1	3- 7- 67+	2 3-  0 7- -2 -4  3 -5
Curve Equation t Generators 4221h1 [0,0,1,-615,-76815] 1 [514:3083:8]

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

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