Cremona's table of elliptic curves

2604 = 2² · 3 · 7 · 31

Class	r	Atkin-Lehner	Eigenvalues
2604a (1 curve)	0	2- 3+ 7+ 31+	2- 3+ -1 7+  0  1 -4  2
Curve Equation t 2604a1 [0,-1,0,-21,-63] 1
2604b (2 curves)	1	2- 3- 7+ 31+	2- 3-  0 7+  0  0 -2 -4
Curve Equation t Generators 2604b1 [0,1,0,-33,-84] 2 [228:476:27] 2604b2 [0,1,0,-68,84] 2 [-5:18:1]
2604c (2 curves)	1	2- 3- 7+ 31+	2- 3-  0 7+ -4 -4  2  4
Curve Equation t Generators 2604c1 [0,1,0,-22713,-1325016] 2 [-87:9:1] 2604c2 [0,1,0,-24428,-1115100] 2 [-104:558:1]
2604d (1 curve)	0	2- 3- 7+ 31-	2- 3-  3 7+  0 -5  0  6
Curve Equation t 2604d1 [0,1,0,91,6759] 1
2604e (2 curves)	0	2- 3- 7- 31+	2- 3-  4 7- -2  2 -8  4
Curve Equation t 2604e1 [0,1,0,4319,-143668] 2 2604e2 [0,1,0,-29316,-1489068] 2
2604f (4 curves)	1	2- 3- 7- 31-	2- 3-  0 7-  0 -4 -6 -4
Curve Equation t Generators 2604f1 [0,1,0,-393,-2448] 6 [-7:3:1] 2604f2 [0,1,0,-2108,34596] 6 [-44:210:1] 2604f3 [0,1,0,-29793,-1989300] 2 [5700:29260:27] 2604f4 [0,1,0,-29828,-1984428] 2 [-101:90:1]

Data from Elliptic Curve Data by J. E. Cremona.
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