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
Class	21840bc	Isogeny class
Conductor	21840	Conductor
∏ cp	16	Product of Tamagawa factors cp
Δ	12283514880 = 212 · 3 · 5 · 7 · 134	Discriminant
Eigenvalues	2- 3+ 5+ 7+  0 13-  2 -4	Hecke eigenvalues for primes up to 20
Equation	[0,-1,0,-9016,-326480]	[a1,a2,a3,a4,a6]
Generators	[-54:2:1]	Generators of the group modulo torsion
j	19790357598649/2998905	j-invariant
L	3.6623515811907	L(r)(E,1)/r!
Ω	0.48994351528367	Real period
R	1.8687621465253	Regulator
r	1	Rank of the group of rational points
S	1	(Analytic) order of Ш
t	2	Number of elements in the torsion subgroup
Twists	1365e4 87360gq4 65520dt4 109200fw4	Quadratic twists by: -4 8 -3 5

Hecke Eigenvalues for elliptic curve 21840bc4

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	-8	6	0	2	6	8	-4	-6	4	-10	-12	4	-6	8	0	6	10

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Quadratic twists for elliptic curve 21840bc4

-4	8	-3	5
1365e4	87360gq4	65520dt4	109200fw4

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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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