Cremona's table of elliptic curves

2021 = 43 · 47

Field	Data	Notes
Atkin-Lehner	43- 47+	Signs for the Atkin-Lehner involutions
Conductor	2021	Conductor
Count	1	Number of curves in isogeny class
Curves	2021a1	Curves in isogeny class
deg	400	Modular degree for the optimal curve
Eigenvalues	-2  0  0 -4 -3 -7 -3 -8	Hecke eigenvalues for primes less than 20
L	1.830209514617	L(r)(E,1)/r!
r	2	Rank of the group of rational points
Twists	32336g 129344a 18189g 50525b	Quadratic twists by: -4 8 -3 5

Hecke Eigenvalues for isogeny class 2021a

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	0	0	-4	-3	-7	-3	-8	-3	8	5	-2	-5	-	+	-1	-4	4	7	8	2	4	-5	-12	-5

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Quadratic twists for isogeny class 2021a

-4	8	-3	5	-7	-43	-47
32336g	129344a	18189g	50525b	99029b	86903g	94987a

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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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