Cremona's table of elliptic curves

20805 = 3 · 5 · 19 · 73

Class	r	Atkin-Lehner	Eigenvalues
20805a (2 curves)	1	3+ 5+ 19+ 73+	-1 3+ 5+ -2  2 -4 -2 19+
Curve Equation t Generators 20805a1 [1,1,1,-14893441,22116045134] 2 [-4324:77613:1] 20805a2 [1,1,1,-15516736,20163386558] 2 [-4343:77404:1]
20805b (1 curve)	1	3+ 5+ 19+ 73+	-2 3+ 5+  4 -2 -1  2 19+
Curve Equation t Generators 20805b1 [0,-1,1,563714,29273142] 1 [165088:6960766:343]
20805c (2 curves)	2	3+ 5- 19+ 73+	-1 3+ 5-  2 -6 -4 -6 19+
Curve Equation t Generators 20805c1 [1,1,1,-95,20] 2 [-10:14:1]&[-7:23:1] 20805c2 [1,1,1,-950,-11608] 2 [-19:14:1]&[-18:16:1]
20805d (1 curve)	0	3+ 5- 19+ 73+	2 3+ 5-  0  2  1  2 19+
Curve Equation t 20805d1 [0,-1,1,-220340,39887093] 1
20805e (2 curves)	0	3- 5+ 19+ 73+	1 3- 5+  4  0  2  6 19+
Curve Equation t 20805e1 [1,0,1,16,17] 2 20805e2 [1,0,1,-79,131] 2

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

Part of Computational Number Theory
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