Cremona's table of elliptic curves

21840 = 2⁴ · 3 · 5 · 7 · 13

Field	Data	Notes
Atkin-Lehner	2- 3- 5- 7+ 13+	Signs for the Atkin-Lehner involutions
Conductor	21840	Conductor
Count	2	Number of curves in isogeny class
Curves	21840cd1 21840cd2	Curves in isogeny class
deg	51840	Modular degree for the optimal curve
Eigenvalues	2- 3- 5- 7+ -4 13+  2 -8	Hecke eigenvalues for primes less than 20
L	1.8980696894858	L(r)(E,1)/r!
r	0	Rank of the group of rational points
Twists	5460c 87360ej 65520co 109200ea	Quadratic twists by: -4 8 -3 5

Hecke Eigenvalues for isogeny class 21840cd

a2	a3	a5	a7	a11	a13	a17	a19	a23	a29	a31	a37	a41	a43	a47	a53	a59	a61	a67	a71	a73	a79	a83	a89	a97
-	-	-	+	-4	+	2	-8	-4	6	-4	-8	2	6	8	0	2	10	0	-8	-2	12	0	-10	10

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Quadratic twists for isogeny class 21840cd

-4	8	-3	5
5460c	87360ej	65520co	109200ea

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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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