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	21840ca	Isogeny class
Conductor	21840	Conductor
∏ cp	16	Product of Tamagawa factors cp
deg	55296	Modular degree for the optimal curve
Δ	-20038287360000 = -1 · 224 · 3 · 54 · 72 · 13	Discriminant
Eigenvalues	2- 3- 5+ 7- -4 13-  6 -4	Hecke eigenvalues for primes up to 20
Equation	[0,1,0,-7896,342804]	[a1,a2,a3,a4,a6]
Generators	[119:1050:1]	Generators of the group modulo torsion
j	-13293525831769/4892160000	j-invariant
L	6.0605498544645	L(r)(E,1)/r!
Ω	0.64373320785788	Real period
R	2.3536729892466	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	2730b1 87360fk1 65520eo1 109200db1	Quadratic twists by: -4 8 -3 5

Hecke Eigenvalues for elliptic curve 21840ca1

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

---

Quadratic twists for elliptic curve 21840ca1

-4	8	-3	5
2730b1	87360fk1	65520eo1	109200db1

---

Data from Elliptic Curve Data by J. E. Cremona.
Design inspired by The Modular Forms Explorer by William Stein.

Part of Computational Number Theory
Back to Tables and computations