Cremona's table of elliptic curves

21808 = 2⁴ · 29 · 47

Class	r	Atkin-Lehner	Eigenvalues
21808a (1 curve)	0	2+ 29+ 47-	2+  2  4  1 -3 -4  0  0
Curve Equation t 21808a1 [0,-1,0,-11,338] 1
21808b (1 curve)	1	2+ 29- 47-	2+ -2  0 -1 -3  0  8  0
Curve Equation t Generators 21808b1 [0,1,0,12,-20] 1 [2:4:1]
21808c (2 curves)	0	2- 29+ 47+	2-  2 -3 -2  0  5  6 -5
Curve Equation t 21808c1 [0,-1,0,-4632,-115984] 1 21808c2 [0,-1,0,-53512,4744944] 1
21808d (1 curve)	1	2- 29+ 47-	2-  0 -1 -4  0 -1  4  7
Curve Equation t Generators 21808d1 [0,0,0,-26723,1547106] 1 [75:32768:27]
21808e (1 curve)	1	2- 29+ 47-	2-  2  2  1  1 -2  2 -4
Curve Equation t Generators 21808e1 [0,-1,0,8,-912] 1 [372:1088:27]
21808f (1 curve)	1	2- 29+ 47-	2- -2 -2  5  3  4 -4 -4
Curve Equation t Generators 21808f1 [0,1,0,-9,10] 1 [2:2:1]
21808g (1 curve)	1	2- 29- 47+	2-  0 -3  4  0  5  0  7
Curve Equation t Generators 21808g1 [0,0,0,-4805579,4054774394] 1 [158195:662:125]
21808h (1 curve)	1	2- 29- 47+	2- -2 -1  2  0  7 -2  5
Curve Equation t Generators 21808h1 [0,1,0,-56,-44] 1 [-2:8:1]

Data from Elliptic Curve Data by J. E. Cremona.
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