Cremona's table of elliptic curves

20181 = 3 · 7 · 31²

Class	r	Atkin-Lehner	Eigenvalues
20181a (1 curve)	1	3+ 7+ 31+	0 3+ -2 7+  4  1  0 -7
Curve Equation t Generators 20181a1 [0,-1,1,19861,33915674] 1 [2892:164798:27]
20181b (1 curve)	1	3+ 7+ 31+	0 3+  4 7+  4 -5  6 -1
Curve Equation t Generators 20181b1 [0,-1,1,-1281,-17236] 1 [52:232:1]
20181c (2 curves)	0	3+ 7+ 31-	1 3+ -2 7+  2  4  0 -4
Curve Equation t 20181c1 [1,1,0,3344,151555] 2 20181c2 [1,1,0,-30291,1718946] 2
20181d (6 curves)	0	3+ 7+ 31-	-1 3+ -2 7+ -4  2  6  4
Curve Equation t 20181d1 [1,1,1,941,2840] 2 20181d2 [1,1,1,-3864,18216] 4 20181d3 [1,1,1,-37499,-2793670] 2 20181d4 [1,1,1,-47109,3910266] 4 20181d5 [1,1,1,-753444,251410050] 2 20181d6 [1,1,1,-32694,6366582] 2
20181e (1 curve)	0	3+ 7- 31+	-2 3+ -2 7-  2  7  2 -1
Curve Equation t 20181e1 [0,-1,1,-129094,-22985136] 1
20181f (1 curve)	0	3+ 7- 31+	-2 3+  4 7-  2  1 -4 -7
Curve Equation t 20181f1 [0,-1,1,-40195106,98099593124] 1
20181g (3 curves)	1	3+ 7- 31-	0 3+ -3 7-  0 -5  0  2
Curve Equation t Generators 20181g1 [0,-1,1,21783,2684135] 1 [269:5285:1] 20181g2 [0,-1,1,-1016097,395288192] 1 [176:14895:1] 20181g3 [0,-1,1,-82345527,287640199565] 1 [41770:18255:8]
20181h (1 curve)	1	3+ 7- 31-	-1 3+  1 7-  3  0 -3 -1
Curve Equation t Generators 20181h1 [1,1,1,-19240,-6403186] 1 [49521612800:454035511403:190109375]
20181i (4 curves)	1	3+ 7- 31-	-1 3+ -2 7-  0  6 -6 -4
Curve Equation t Generators 20181i1 [1,1,1,34576,2516816] 4 [-2:1565:1] 20181i2 [1,1,1,-200869,23706866] 4 [20127:448843:27] 20181i3 [1,1,1,-1243554,-515986890] 2 [373574982:-2491302659:287496] 20181i4 [1,1,1,-2925304,1924272722] 2 [60692:99357:64]
20181j (1 curve)	1	3- 7+ 31-	0 3- -2 7+ -4 -1  0 -7
Curve Equation t Generators 20181j1 [0,1,1,21,-1132] 1 [18:73:1]
20181k (1 curve)	1	3- 7+ 31-	0 3-  4 7+ -4  5 -6 -1
Curve Equation t Generators 20181k1 [0,1,1,-1231361,525782738] 1 [482742:796328:729]
20181l (1 curve)	1	3- 7- 31+	-1 3-  1 7- -3  0  3 -1
Curve Equation t Generators 20181l1 [1,0,0,-20,213] 1 [3:12:1]
20181m (2 curves)	2	3- 7- 31-	1 3- -2 7- -2 -4 -8 -4
Curve Equation t Generators 20181m1 [1,0,1,-5378257,4817149415] 2 [1165:10949:1]&[5910:279575:8] 20181m2 [1,0,1,-86135892,307690583719] 2 [-1699:671022:1]&[4637:87054:1]
20181n (2 curves)	0	3- 7- 31-	1 3-  4 7- -2  2 -2  8
Curve Equation t 20181n1 [1,0,1,-3384,-41831] 2 20181n2 [1,0,1,11031,-301301] 2
20181o (1 curve)	2	3- 7- 31-	-2 3- -2 7- -2 -7 -2 -1
Curve Equation t Generators 20181o1 [0,1,1,-134,728] 1 [-11:31:1]&[-2:31:1]
20181p (1 curve)	0	3- 7- 31-	-2 3-  4 7- -2 -1  4 -7
Curve Equation t 20181p1 [0,1,1,-38627497186,-2922098703793772] 1

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