Cremona's table of elliptic curves

221 = 13 · 17

Field	Data	Notes
Atkin-Lehner	13+ 17-	Signs for the Atkin-Lehner involutions
Conductor	221	Conductor
Count	2	Number of curves in isogeny class
Curves	221a1 221a2	Curves in isogeny class
deg	120	Modular degree for the optimal curve
Eigenvalues	-1  0  4 -2  6 13+ 17-  8	Hecke eigenvalues for primes less than 20
L	0.96251248411225	L(r)(E,1)/r!
r	0	Rank of the group of rational points
Twists	3536i 14144m 1989b 5525d	Quadratic twists by: -4 8 -3 5

Hecke Eigenvalues for isogeny class 221a

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

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Quadratic twists for isogeny class 221a

-4	8	-3	5	-7	-11	13	17	-19	-23
3536i	14144m	1989b	5525d	10829c	26741f	2873b	3757b	79781d	116909c

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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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