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	21840bu	Isogeny class
Conductor	21840	Conductor
∏ cp	32	Product of Tamagawa factors cp
Δ	171969208320 = 213 · 3 · 5 · 72 · 134	Discriminant
Eigenvalues	2- 3- 5+ 7+  4 13- -2 -4	Hecke eigenvalues for primes up to 20
Equation	[0,1,0,-125496,-17153580]	[a1,a2,a3,a4,a6]
j	53365044437418169/41984670	j-invariant
L	2.0292324699994	L(r)(E,1)/r!
Ω	0.25365405874993	Real period
R	1	Regulator
r	0	Rank of the group of rational points
S	1	(Analytic) order of Ш
t	2	Number of elements in the torsion subgroup
Twists	2730f4 87360fa4 65520dz4 109200dr4	Quadratic twists by: -4 8 -3 5

Hecke Eigenvalues for elliptic curve 21840bu4

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	-4	-4	-6	-4	-2	-2	4	-8	6	12	-10	0	8	14	0	4	6	-10

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Quadratic twists for elliptic curve 21840bu4

-4	8	-3	5
2730f4	87360fa4	65520dz4	109200dr4

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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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