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	4	Number of curves in isogeny class
Curves	21840b1 21840b2 21840b3 21840b4	Curves in isogeny class
deg	307200	Modular degree for the optimal curve
Eigenvalues	2+ 3+ 5+ 7+  0 13-  2 -4	Hecke eigenvalues for primes less than 20
L	0.92582550775556	L(r)(E,1)/r!
r	0	Rank of the group of rational points
Twists	10920r 87360gp 65520bg 109200bu	Quadratic twists by: -4 8 -3 5

Hecke Eigenvalues for isogeny class 21840b

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
+	+	+	+	0	-	2	-4	0	-10	8	-10	-2	4	4	-2	0	-2	4	-4	-14	16	-8	6	10

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Quadratic twists for isogeny class 21840b

-4	8	-3	5
10920r	87360gp	65520bg	109200bu

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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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