Cremona's table of elliptic curves

21580 = 2² · 5 · 13 · 83

Class	r	Atkin-Lehner	Eigenvalues
21580a (1 curve)	1	2- 5+ 13- 83+	2-  2 5+  1  0 13- -2  5
Curve Equation t Generators 21580a1 [0,-1,0,19,41] 1 [74:243:8]
21580b (1 curve)	0	2- 5- 13- 83+	2-  0 5-  0  6 13- -4 -5
Curve Equation t 21580b1 [0,0,0,18808,10262644] 1
21580c (1 curve)	0	2- 5- 13- 83+	2-  0 5-  5 -4 13-  6 -5
Curve Equation t 21580c1 [0,0,0,-10052,-446379] 1
21580d (1 curve)	2	2- 5- 13- 83+	2- -1 5- -5  1 13- -3  0
Curve Equation t Generators 21580d1 [0,-1,0,-345,2650] 1 [-15:65:1]&[-5:65:1]
21580e (1 curve)	0	2- 5- 13- 83+	2- -2 5-  3  2 13- -2  4
Curve Equation t 21580e1 [0,1,0,-5,55] 1
21580f (1 curve)	0	2- 5- 13- 83+	2-  3 5-  3 -3 13- -7  4
Curve Equation t 21580f1 [0,0,0,-93018292,-345303241051] 1
21580g (1 curve)	1	2- 5- 13- 83-	2- -1 5-  1  1 13- -5  6
Curve Equation t Generators 21580g1 [0,-1,0,2075,6302] 1 [-1:65:1]

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