Cremona's table of elliptic curves

20956 = 2² · 13² · 31

Class	r	Atkin-Lehner	Eigenvalues
20956a (1 curve)	0	2- 13+ 31+	2- -1  2  1 -1 13+  7  5
Curve Equation t 20956a1 [0,-1,0,-66642,4015465] 1
20956b (1 curve)	0	2- 13+ 31+	2-  2 -1 -3 -2 13+  6 -3
Curve Equation t 20956b1 [0,-1,0,-11886,-634063] 1
20956c (2 curves)	0	2- 13+ 31+	2- -2  3  1  6 13+  6  1
Curve Equation t 20956c1 [0,1,0,-394,3693] 1 20956c2 [0,1,0,2986,-36191] 1
20956d (1 curve)	1	2- 13+ 31-	2-  0 -1 -3 -6 13+  0  5
Curve Equation t Generators 20956d1 [0,0,0,-2873,-59319] 1 [65:169:1]
20956e (1 curve)	1	2- 13+ 31-	2-  0  4  2 -1 13+  0  0
Curve Equation t Generators 20956e1 [0,0,0,-45968,177913060] 1 [42120:1770782:125]
20956f (1 curve)	1	2- 13+ 31-	2- -1 -2 -1  1 13+  7 -5
Curve Equation t Generators 20956f1 [0,-1,0,-394,1949] 1 [19:31:1]
20956g (1 curve)	1	2- 13+ 31-	2-  2  1 -1 -2 13+  4 -5
Curve Equation t Generators 20956g1 [0,-1,0,-156550,-23789091] 1 [157297992436197013215:9134253055216272340279:45981597397600593]
20956h (1 curve)	1	2- 13+ 31-	2- -2 -3  3 -2 13+  0  7
Curve Equation t Generators 20956h1 [0,1,0,958,-28079] 1 [30:169:1]

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