Cremona's table of elliptic curves

21804 = 2² · 3 · 23 · 79

Field	Data	Notes
Atkin-Lehner	2- 3- 23- 79+	Signs for the Atkin-Lehner involutions
Class	21804b	Isogeny class
Conductor	21804	Conductor
∏ cp	27	Product of Tamagawa factors cp
deg	27648	Modular degree for the optimal curve
Δ	-9155586816 = -1 · 28 · 39 · 23 · 79	Discriminant
Eigenvalues	2- 3- -3 -4 -3 -6  6  2	Hecke eigenvalues for primes up to 20
Equation	[0,1,0,-1997,33999]	[a1,a2,a3,a4,a6]
Generators	[61:-378:1] [13:102:1]	Generators of the group modulo torsion
j	-3442194423808/35764011	j-invariant
L	6.9212497887528	L(r)(E,1)/r!
Ω	1.3042748626139	Real period
R	0.19654030919137	Regulator
r	2	Rank of the group of rational points
S	0.99999999999981	(Analytic) order of Ш
t	1	Number of elements in the torsion subgroup
Twists	87216f1 65412b1	Quadratic twists by: -4 -3

Hecke Eigenvalues for elliptic curve 21804b1

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
-	-	-3	-4	-3	-6	6	2	-	-5	1	-7	-10	-3	0	-14	-5	6	-4	-9	-11	+	-15	-9	-4

---

Quadratic twists for elliptic curve 21804b1

-4	-3
87216f1	65412b1

---

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