Cremona's table of elliptic curves

1840 = 2⁴ · 5 · 23

Class	r	Atkin-Lehner	Eigenvalues
1840a (1 curve)	1	2+ 5+ 23+	2+ -1 5+  2  0  1 -4  4
Curve Equation t Generators 1840a1 [0,-1,0,4,-5] 1 [3:5:1]
1840b (1 curve)	0	2+ 5- 23+	2+  0 5- -1  6 -2 -3  6
Curve Equation t 1840b1 [0,0,0,1468,2844] 1
1840c (1 curve)	0	2+ 5- 23+	2+  3 5-  2  0  1  0  0
Curve Equation t 1840c1 [0,0,0,-187,-991] 1
1840d (1 curve)	1	2+ 5- 23-	2+  1 5-  0 -2 -5 -4  2
Curve Equation t Generators 1840d1 [0,1,0,0,23] 1 [1:5:1]
1840e (1 curve)	0	2- 5+ 23+	2-  0 5+ -1 -2 -2  3  2
Curve Equation t 1840e1 [0,0,0,112,688] 1
1840f (2 curves)	0	2- 5+ 23+	2- -1 5+  4  6 -1  0 -2
Curve Equation t 1840f1 [0,-1,0,-46,-529] 1 1840f2 [0,-1,0,414,13915] 1
1840g (1 curve)	1	2- 5+ 23-	2-  0 5+  1 -6  6  7 -2
Curve Equation t Generators 1840g1 [0,0,0,-8,12] 1 [2:2:1]
1840h (1 curve)	1	2- 5+ 23-	2- -3 5+ -2  0 -3  4  4
Curve Equation t Generators 1840h1 [0,0,0,-73,-2453] 1 [26:115:1]
1840i (1 curve)	0	2- 5- 23-	2-  1 5-  2  4  1  0  4
Curve Equation t 1840i1 [0,1,0,-10,-17] 1

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