Cremona's table of elliptic curves

21008 = 2⁴ · 13 · 101

Field	Data	Notes
Atkin-Lehner	2+ 13+ 101+	Signs for the Atkin-Lehner involutions
Class	21008a	Isogeny class
Conductor	21008	Conductor
∏ cp	4	Product of Tamagawa factors cp
Δ	124801973504 = 28 · 136 · 101	Discriminant
Eigenvalues	2+  0 -2 -2 -6 13+  2  4	Hecke eigenvalues for primes up to 20
Equation	[0,0,0,-1271,3910]	[a1,a2,a3,a4,a6]
Generators	[-15:140:1]	Generators of the group modulo torsion
j	886993420752/487507709	j-invariant
L	2.8044955112008	L(r)(E,1)/r!
Ω	0.90788577087186	Real period
R	3.0890400545738	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	10504a2 84032t2	Quadratic twists by: -4 8

Hecke Eigenvalues for elliptic curve 21008a2

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	-2	-2	-6	+	2	4	0	-6	-4	10	0	4	-4	14	2	6	2	12	8	8	2	-16	10

---

Quadratic twists for elliptic curve 21008a2

-4	8
10504a2	84032t2

---

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