Cremona's table of elliptic curves

20615 = 5 · 7 · 19 · 31

Class	r	Atkin-Lehner	Eigenvalues
20615a (2 curves)	1	5+ 7+ 19- 31-	1  2 5+ 7+  0  0  4 19-
Curve Equation t Generators 20615a1 [1,1,0,152,1083] 2 [-114:589:27] 20615a2 [1,1,0,-1073,10148] 2 [-32:130:1]
20615b (2 curves)	1	5+ 7+ 19- 31-	-1 -2 5+ 7+  0  4  2 19-
Curve Equation t Generators 20615b1 [1,0,0,-336,2335] 2 [-21:26:1] 20615b2 [1,0,0,-181,4536] 2 [11:57:1]
20615c (2 curves)	0	5+ 7- 19+ 31+	-1  2 5+ 7-  0 -4  6 19+
Curve Equation t 20615c1 [1,1,1,399,-4426] 2 20615c2 [1,1,1,-2926,-49646] 2
20615d (2 curves)	1	5+ 7- 19- 31+	1  0 5+ 7- -2 -4  0 19-
Curve Equation t Generators 20615d1 [1,-1,0,175,0] 2 [36:210:1] 20615d2 [1,-1,0,-700,525] 2 [-4:59:1]
20615e (2 curves)	1	5- 7+ 19+ 31-	-1  2 5- 7+  2  2  8 19+
Curve Equation t Generators 20615e1 [1,1,1,56190,1888862] 2 [21909:640732:27] 20615e2 [1,1,1,-240685,15307612] 2 [-1714:61303:8]
20615f (2 curves)	1	5- 7+ 19+ 31-	-1  2 5- 7+ -2 -2  0 19+
Curve Equation t Generators 20615f1 [1,1,1,-11400,-477640] 2 [372372:28215757:64] 20615f2 [1,1,1,-182875,-30177110] 2 [917122947660:69346985862187:157464000]
20615g (4 curves)	1	5- 7+ 19- 31+	-1  0 5- 7+  0  6 -2 19-
Curve Equation t Generators 20615g1 [1,-1,1,-2977,65504] 4 [17:131:1] 20615g2 [1,-1,1,-48102,4072604] 4 [766:4263:8] 20615g3 [1,-1,1,-48577,3988434] 2 [92710:477851:1000] 20615g4 [1,-1,1,-769627,260069674] 2 [110058:-31727:216]
20615h (1 curve)	1	5- 7- 19+ 31+	0 -1 5- 7- -1  3  3 19+
Curve Equation t Generators 20615h1 [0,-1,1,-628335,-215375952] 1 [1044:16292:1]
20615i (1 curve)	1	5- 7- 19+ 31+	-2  2 5- 7-  0  2  3 19+
Curve Equation t Generators 20615i1 [0,-1,1,90,-2402] 1 [14:37:1]
20615j (1 curve)	1	5- 7- 19- 31-	0 -1 5- 7-  3  3  7 19-
Curve Equation t Generators 20615j1 [0,-1,1,1255,11688] 1 [44:387:1]

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