Cremona's table of elliptic curves

21645 = 3² · 5 · 13 · 37

Field	Data	Notes
Atkin-Lehner	3- 5+ 13+ 37+	Signs for the Atkin-Lehner involutions
Class	21645d	Isogeny class
Conductor	21645	Conductor
∏ cp	16	Product of Tamagawa factors cp
Δ	-948724700625 = -1 · 38 · 54 · 132 · 372	Discriminant
Eigenvalues	-1 3- 5+ -2 -2 13+ -6 -4	Hecke eigenvalues for primes up to 20
Equation	[1,-1,1,-1823,56072]	[a1,a2,a3,a4,a6]
Generators	[-24:304:1] [3:223:1]	Generators of the group modulo torsion
j	-918613512361/1301405625	j-invariant
L	4.4432641645577	L(r)(E,1)/r!
Ω	0.7940524861585	Real period
R	1.398920172788	Regulator
r	2	Rank of the group of rational points
S	0.99999999999985	(Analytic) order of Ш
t	2	Number of elements in the torsion subgroup
Twists	7215i2 108225y2	Quadratic twists by: -3 5

Hecke Eigenvalues for elliptic curve 21645d2

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	-	+	-2	-2	+	-6	-4	2	2	-4	+	10	-6	-2	-2	0	-6	-2	-10	-14	10	-6	-6	2

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Quadratic twists for elliptic curve 21645d2

-3	5
7215i2	108225y2

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Data from Elliptic Curve Data by J. E. Cremona.
Design inspired by The Modular Forms Explorer by William Stein.

Part of Computational Number Theory
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