Cremona's table of elliptic curves

21320 = 2³ · 5 · 13 · 41

Class	r	Atkin-Lehner	Eigenvalues
21320a (1 curve)	0	2+ 5- 13+ 41+	2+ -1 5-  2  2 13+  4  4
Curve Equation t 21320a1 [0,-1,0,-840,19419100] 1
21320b (2 curves)	0	2- 5+ 13- 41-	2-  0 5+  2 -6 13-  0  2
Curve Equation t 21320b1 [0,0,0,-10643,134942] 2 21320b2 [0,0,0,-135643,19209942] 2
21320c (4 curves)	0	2- 5- 13+ 41-	2-  0 5- -4 -4 13+  6  4
Curve Equation t 21320c1 [0,0,0,-842,29] 4 21320c2 [0,0,0,-9247,-341214] 4 21320c3 [0,0,0,-5147,-645434] 2 21320c4 [0,0,0,-147827,-21876546] 2

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

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