Cremona's table of elliptic curves

20976 = 2⁴ · 3 · 19 · 23

Class	r	Atkin-Lehner	Eigenvalues
20976a (1 curve)	0	2+ 3+ 19+ 23-	2+ 3+ -2  4  6  1 -5 19+
Curve Equation t 20976a1 [0,-1,0,-496304,134742240] 1
20976b (1 curve)	1	2+ 3- 19- 23+	2+ 3- -3  1  5 -2  3 19-
Curve Equation t Generators 20976b1 [0,1,0,143,-181] 1 [14:69:1]
20976c (1 curve)	0	2+ 3- 19- 23-	2+ 3- -1  1  3 -4 -7 19-
Curve Equation t 20976c1 [0,1,0,-401,-3237] 1
20976d (1 curve)	1	2- 3+ 19+ 23-	2- 3+  1 -1  3 -6 -5 19+
Curve Equation t Generators 20976d1 [0,-1,0,-7445,-246051] 1 [6404:1863:64]
20976e (4 curves)	1	2- 3+ 19+ 23-	2- 3+ -2 -4  0  6 -2 19+
Curve Equation t Generators 20976e1 [0,-1,0,-304,161728] 2 [-38:342:1] 20976e2 [0,-1,0,-46384,3811264] 4 [-56:2496:1] 20976e3 [0,-1,0,-90544,-4561472] 2 [-102:1898:1] 20976e4 [0,-1,0,-739504,245017024] 4 [666:6890:1]
20976f (1 curve)	1	2- 3+ 19+ 23-	2- 3+ -3 -1 -1  0 -5 19+
Curve Equation t Generators 20976f1 [0,-1,0,283,-52851] 1 [44:207:1]
20976g (1 curve)	1	2- 3- 19+ 23+	2- 3- -1 -1  1  0  5 19+
Curve Equation t Generators 20976g1 [0,1,0,-22581,-3287709] 1 [198:207:1]
20976h (1 curve)	1	2- 3- 19+ 23+	2- 3-  2 -4 -2  3  5 19+
Curve Equation t Generators 20976h1 [0,1,0,-192,1332] 1 [-6:48:1]
20976i (2 curves)	1	2- 3- 19+ 23+	2- 3- -2 -2 -2  2  0 19+
Curve Equation t Generators 20976i1 [0,1,0,176,-136300] 2 [98:912:1] 20976i2 [0,1,0,-38704,-2889004] 2 [-124:138:1]
20976j (6 curves)	0	2- 3- 19- 23+	2- 3- -2  0  4 -2 -6 19-
Curve Equation t 20976j1 [0,1,0,-90464,-10502988] 2 20976j2 [0,1,0,-90544,-10483564] 4 20976j3 [0,1,0,-132864,265716] 8 20976j4 [0,1,0,-49504,-19988428] 2 20976j5 [0,1,0,-1474224,686505492] 4 20976j6 [0,1,0,531376,2656980] 4
20976k (2 curves)	0	2- 3- 19- 23+	2- 3- -2  2 -6 -6  4 19-
Curve Equation t 20976k1 [0,1,0,-292144,-62824108] 2 20976k2 [0,1,0,-4715824,-3943276204] 2
20976l (1 curve)	2	2- 3- 19- 23+	2- 3- -3 -3 -3 -4 -1 19-
Curve Equation t Generators 20976l1 [0,1,0,-77,6231] 1 [-17:54:1]&[-14:69:1]
20976m (1 curve)	1	2- 3- 19- 23-	2- 3- -1 -3  3  4 -7 19-
Curve Equation t Generators 20976m1 [0,1,0,-517861,143267183] 1 [971:23598:1]
20976n (1 curve)	1	2- 3- 19- 23-	2- 3- -1  5  3  0 -7 19-
Curve Equation t Generators 20976n1 [0,1,0,299,-529] 1 [23:138:1]
20976o (1 curve)	1	2- 3- 19- 23-	2- 3-  2  0 -6  7 -1 19-
Curve Equation t Generators 20976o1 [0,1,0,-37392,-6935532] 1 [14934:321632:27]

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