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	21840k	Isogeny class
Conductor	21840	Conductor
∏ cp	128	Product of Tamagawa factors cp
Δ	24031299612902400 = 210 · 34 · 52 · 74 · 136	Discriminant
Eigenvalues	2+ 3- 5+ 7+  0 13+ -6 -8	Hecke eigenvalues for primes up to 20
Equation	[0,1,0,-1614816,-790331580]	[a1,a2,a3,a4,a6]
j	454771411897393003396/23468066028225	j-invariant
L	1.0714208733614	L(r)(E,1)/r!
Ω	0.13392760917018	Real period
R	1	Regulator
r	0	Rank of the group of rational points
S	1	(Analytic) order of Ш
t	4	Number of elements in the torsion subgroup
Twists	10920b2 87360fc2 65520bb2 109200t2	Quadratic twists by: -4 8 -3 5

Hecke Eigenvalues for elliptic curve 21840k2

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
+	-	+	+	0	+	-6	-8	-4	6	0	-6	-6	4	-8	2	-8	-2	12	0	-2	-8	4	18	-2

---

Quadratic twists for elliptic curve 21840k2

-4	8	-3	5
10920b2	87360fc2	65520bb2	109200t2

---

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