Cremona's table of elliptic curves

21056 = 2⁶ · 7 · 47

Field	Data	Notes
Atkin-Lehner	2- 7+ 47-	Signs for the Atkin-Lehner involutions
Class	21056s	Isogeny class
Conductor	21056	Conductor
∏ cp	16	Product of Tamagawa factors cp
Δ	8515965452288 = 215 · 76 · 472	Discriminant
Eigenvalues	2-  2  2 7+  2 -6  6 -4	Hecke eigenvalues for primes up to 20
Equation	[0,-1,0,-21537,1215617]	[a1,a2,a3,a4,a6]
Generators	[2487:1880:27]	Generators of the group modulo torsion
j	33717049708616/259886641	j-invariant
L	8.1197823738876	L(r)(E,1)/r!
Ω	0.73842765932113	Real period
R	2.7490107769502	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	21056bb2 10528b2	Quadratic twists by: -4 8

Hecke Eigenvalues for elliptic curve 21056s2

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
-	2	2	+	2	-6	6	-4	0	0	0	-6	6	6	-	-2	-6	-8	-10	0	-10	-8	6	-6	6

---

Quadratic twists for elliptic curve 21056s2

-4	8
21056bb2	10528b2

---

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