Cremona's table of elliptic curves

5239 = 13² · 31

Class	r	Atkin-Lehner	Eigenvalues
5239a (1 curve)	1	13+ 31+	1  0 -3  2  0 13+  5  4
Curve Equation t Generators 5239a1 [1,-1,0,-116,573] 1 [-4:33:1]
5239b (1 curve)	0	13+ 31-	-1  0  3 -2  0 13+  5 -4
Curve Equation t 5239b1 [1,-1,1,-19636,1200008] 1
5239c (1 curve)	0	13- 31+	0  2  4  2 -1 13-  2 -2
Curve Equation t 5239c1 [0,-1,1,9,-11] 1
5239d (1 curve)	1	13- 31-	0  2 -4 -2  1 13-  2  2
Curve Equation t Generators 5239d1 [0,-1,1,1465,-17678] 1 [958:29659:1]

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

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