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	21840bi	Isogeny class
Conductor	21840	Conductor
∏ cp	8	Product of Tamagawa factors cp
Δ	2096640000 = 212 · 32 · 54 · 7 · 13	Discriminant
Eigenvalues	2- 3+ 5+ 7- -4 13+  6 -8	Hecke eigenvalues for primes up to 20
Equation	[0,-1,0,-69896,7135920]	[a1,a2,a3,a4,a6]
Generators	[154:22:1]	Generators of the group modulo torsion
j	9219915604149769/511875	j-invariant
L	3.7687721567679	L(r)(E,1)/r!
Ω	1.1035227354989	Real period
R	1.7076096556652	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	1365c3 87360hi4 65520ef4 109200ft4	Quadratic twists by: -4 8 -3 5

Hecke Eigenvalues for elliptic curve 21840bi4

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	+	6	-8	4	-2	4	10	-2	-8	-8	6	-8	-10	12	8	6	-8	4	6	-2

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Quadratic twists for elliptic curve 21840bi4

-4	8	-3	5
1365c3	87360hi4	65520ef4	109200ft4

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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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