Cremona's table of elliptic curves

21945 = 3 · 5 · 7 · 11 · 19

Field	Data	Notes
Atkin-Lehner	3- 5+ 7- 11- 19-	Signs for the Atkin-Lehner involutions
Class	21945y	Isogeny class
Conductor	21945	Conductor
∏ cp	32	Product of Tamagawa factors cp
Δ	481583025 = 32 · 52 · 72 · 112 · 192	Discriminant
Eigenvalues	-1 3- 5+ 7- 11- -6 -2 19-	Hecke eigenvalues for primes up to 20
Equation	[1,0,0,-196,-49]	[a1,a2,a3,a4,a6]
Generators	[-7:35:1]	Generators of the group modulo torsion
j	832972004929/481583025	j-invariant
L	3.6392986277506	L(r)(E,1)/r!
Ω	1.3958857564887	Real period
R	1.3035804007719	Regulator
r	1	Rank of the group of rational points
S	1	(Analytic) order of Ш
t	4	Number of elements in the torsion subgroup
Twists	65835bl2 109725k2	Quadratic twists by: -3 5

Hecke Eigenvalues for elliptic curve 21945y2

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
-1	-	+	-	-	-6	-2	-	8	6	4	2	-2	-4	-8	-10	-4	-14	4	8	10	-8	-16	-14	14

---

Quadratic twists for elliptic curve 21945y2

-3	5
65835bl2	109725k2

---

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