Cremona's table of elliptic curves

81900 = 2² · 3² · 5² · 7 · 13

Class	r	Atkin-Lehner	Eigenvalues
81900a (2 curves)	0	2- 3+ 5+ 7+ 13+	2- 3+ 5+ 7+  2 13+  0  4
Curve Equation t 81900a1 [0,0,0,-15300,830125] 2 81900a2 [0,0,0,-254175,49321750] 2
81900b (2 curves)	0	2- 3+ 5+ 7+ 13+	2- 3+ 5+ 7+ -2 13+  0  4
Curve Equation t 81900b1 [0,0,0,-137700,-22413375] 2 81900b2 [0,0,0,-2287575,-1331687250] 2
81900c (2 curves)	1	2- 3+ 5+ 7+ 13-	2- 3+ 5+ 7+  4 13-  4 -4
Curve Equation t Generators 81900c1 [0,0,0,27000,1306125] 2 [20836:427427:64] 81900c2 [0,0,0,-138375,11724750] 2 [1390:50050:1]
81900d (2 curves)	1	2- 3+ 5+ 7+ 13-	2- 3+ 5+ 7+ -4 13- -4 -4
Curve Equation t Generators 81900d1 [0,0,0,3000,-48375] 2 [64:-637:1] 81900d2 [0,0,0,-15375,-434250] 2 [295:-4550:1]
81900e (2 curves)	1	2- 3+ 5+ 7- 13+	2- 3+ 5+ 7-  2 13+ -4 -4
Curve Equation t Generators 81900e1 [0,0,0,8100,-124875] 2 [5631:422604:1] 81900e2 [0,0,0,-35775,-1046250] 2 [-170:350:1]
81900f (2 curves)	1	2- 3+ 5+ 7- 13+	2- 3+ 5+ 7- -2 13+  4 -4
Curve Equation t Generators 81900f1 [0,0,0,900,4625] 2 [20:-175:1] 81900f2 [0,0,0,-3975,38750] 2 [115:-1050:1]
81900g (4 curves)	1	2- 3- 5+ 7+ 13+	2- 3- 5+ 7+  0 13+  0 -4
Curve Equation t Generators 81900g1 [0,0,0,-283800,-95122375] 2 [1630:61425:1] 81900g2 [0,0,0,-5300175,-4695138250] 2 [2659:3402:1] 81900g3 [0,0,0,2362200,1650576125] 2 [10322:661941:8] 81900g4 [0,0,0,-14939175,16304840750] 2 [170981798:166465719:54872]
81900h (2 curves)	1	2- 3- 5+ 7+ 13+	2- 3- 5+ 7+  0 13+ -3  2
Curve Equation t Generators 81900h1 [0,0,0,-615,-7810] 1 [31:54:1] 81900h2 [0,0,0,4785,90470] 1 [-14:144:1]
81900i (4 curves)	1	2- 3- 5+ 7+ 13+	2- 3- 5+ 7+  0 13+  6 -4
Curve Equation t Generators 81900i1 [0,0,0,39300,-6040375] 2 [130:1125:1] 81900i2 [0,0,0,-355575,-69615250] 2 [-265:2450:1] 81900i3 [0,0,0,-365700,196662125] 2 [-545:15300:1] 81900i4 [0,0,0,-7780575,8345609750] 2 [360580:-24231375:64]
81900j (2 curves)	1	2- 3- 5+ 7+ 13+	2- 3- 5+ 7+  0 13+ -6  2
Curve Equation t Generators 81900j1 [0,0,0,-165000,-14537500] 1 [-244:3346:1] 81900j2 [0,0,0,-6015000,5677512500] 1 [221516864:9073788199:262144]
81900k (1 curve)	1	2- 3- 5+ 7+ 13+	2- 3- 5+ 7+  2 13+  6  4
Curve Equation t Generators 81900k1 [0,0,0,-57450000,-167602587500] 1 [-39331196006413869500667744400368216999597117:2855045450145139393856504866625941047285727:9004276761253617853910864086516515859703]
81900l (2 curves)	1	2- 3- 5+ 7+ 13+	2- 3- 5+ 7+  3 13+ -6  2
Curve Equation t Generators 81900l1 [0,0,0,555,-3715] 1 [19:-117:1] 81900l2 [0,0,0,-5745,225605] 1 [1636:19773:64]
81900m (1 curve)	1	2- 3- 5+ 7+ 13+	2- 3- 5+ 7+  5 13+  0  4
Curve Equation t Generators 81900m1 [0,0,0,1275,16585] 1 [24:247:1]
81900n (2 curves)	0	2- 3- 5+ 7+ 13-	2- 3- 5+ 7+  0 13-  2 -8
Curve Equation t 81900n1 [0,0,0,-300,-149875] 2 81900n2 [0,0,0,-44175,-3528250] 2
81900o (2 curves)	0	2- 3- 5+ 7+ 13-	2- 3- 5+ 7+  0 13-  4  0
Curve Equation t 81900o1 [0,0,0,-6600,-230375] 2 81900o2 [0,0,0,-108975,-13846250] 2
81900p (1 curve)	0	2- 3- 5+ 7+ 13-	2- 3- 5+ 7+ -1 13-  2 -6
Curve Equation t 81900p1 [0,0,0,-6695625,6668603125] 1
81900q (1 curve)	0	2- 3- 5+ 7+ 13-	2- 3- 5+ 7+  2 13- -4 -1
Curve Equation t 81900q1 [0,0,0,-131400,-18373500] 1
81900r (2 curves)	0	2- 3- 5+ 7+ 13-	2- 3- 5+ 7+ -4 13-  2  8
Curve Equation t 81900r1 [0,0,0,1146300,-421605875] 2 81900r2 [0,0,0,-6268575,-3899182250] 2
81900s (2 curves)	0	2- 3- 5+ 7+ 13-	2- 3- 5+ 7+ -4 13- -4  0
Curve Equation t 81900s1 [0,0,0,931200,-148059875] 2 81900s2 [0,0,0,-4085175,-1236613250] 2
81900t (1 curve)	0	2- 3- 5+ 7+ 13-	2- 3- 5+ 7+  5 13- -4 -8
Curve Equation t 81900t1 [0,0,0,-440625,-139334375] 1
81900u (1 curve)	0	2- 3- 5+ 7+ 13-	2- 3- 5+ 7+  6 13- -8  3
Curve Equation t 81900u1 [0,0,0,-82200,9290500] 1
81900v (1 curve)	0	2- 3- 5+ 7- 13+	2- 3- 5+ 7- -2 13+ -4  1
Curve Equation t 81900v1 [0,0,0,-445800,-287673500] 1
81900w (1 curve)	0	2- 3- 5+ 7- 13+	2- 3- 5+ 7- -3 13+  4 -6
Curve Equation t 81900w1 [0,0,0,-353188125,2555509415625] 1
81900x (1 curve)	0	2- 3- 5+ 7- 13+	2- 3- 5+ 7-  4 13+ -2 -1
Curve Equation t 81900x1 [0,0,0,-1200,-29500] 1
81900y (2 curves)	0	2- 3- 5+ 7- 13+	2- 3- 5+ 7- -4 13+  8 -4
Curve Equation t 81900y1 [0,0,0,-1200,512125] 2 81900y2 [0,0,0,-103575,12694750] 2
81900z (1 curve)	0	2- 3- 5+ 7- 13+	2- 3- 5+ 7-  6 13+ -2  0
Curve Equation t 81900z1 [0,0,0,-1440,10260] 1
81900ba (2 curves)	1	2- 3- 5+ 7- 13-	2- 3- 5+ 7-  0 13- -4 -8
Curve Equation t Generators 81900ba1 [0,0,0,11400,-793375] 2 [94:1053:1] 81900ba2 [0,0,0,-90975,-8676250] 2 [-185:1350:1]
81900bb (2 curves)	1	2- 3- 5+ 7- 13-	2- 3- 5+ 7-  2 13-  4  4
Curve Equation t Generators 81900bb1 [0,0,0,-70500,-13977875] 2 [81330:8197475:8] 81900bb2 [0,0,0,-1401375,-638158250] 2 [108538518:10880791753:10648]
81900bc (2 curves)	1	2- 3- 5+ 7- 13-	2- 3- 5+ 7-  4 13- -6  0
Curve Equation t Generators 81900bc1 [0,0,0,-23700,1947125] 2 [55:900:1] 81900bc2 [0,0,0,-418575,104219750] 2 [-190:13300:1]
81900bd (1 curve)	1	2- 3- 5+ 7- 13-	2- 3- 5+ 7-  4 13- -7 -2
Curve Equation t Generators 81900bd1 [0,0,0,-114189375,498175793750] 1 [3286:398034:1]
81900be (1 curve)	1	2- 3- 5+ 7- 13-	2- 3- 5+ 7-  5 13-  4 -2
Curve Equation t Generators 81900be1 [0,0,0,-12585,911545] 1 [101:819:1]
81900bf (2 curves)	0	2- 3- 5- 7+ 13+	2- 3- 5- 7+  4 13+ -2 -6
Curve Equation t 81900bf1 [0,0,0,183660,16225225] 2 81900bf2 [0,0,0,-843015,138399550] 2
81900bg (1 curve)	0	2- 3- 5- 7+ 13+	2- 3- 5- 7+  4 13+  7 -2
Curve Equation t 81900bg1 [0,0,0,-4567575,3985406350] 1
81900bh (1 curve)	0	2- 3- 5- 7+ 13+	2- 3- 5- 7+  5 13+ -4 -2
Curve Equation t 81900bh1 [0,0,0,-314625,113943125] 1
81900bi (1 curve)	1	2- 3- 5- 7+ 13-	2- 3- 5- 7+ -3 13- -4 -6
Curve Equation t Generators 81900bi1 [0,0,0,-14127525,20444075325] 1 [2409:19773:1]
81900bj (1 curve)	1	2- 3- 5- 7+ 13-	2- 3- 5- 7+  6 13-  2  0
Curve Equation t Generators 81900bj1 [0,0,0,-36000,1282500] 1 [-164:1666:1]
81900bk (1 curve)	1	2- 3- 5- 7- 13+	2- 3- 5- 7- -1 13+ -2 -6
Curve Equation t Generators 81900bk1 [0,0,0,-267825,53348825] 1 [271:-819:1]
81900bl (1 curve)	1	2- 3- 5- 7- 13+	2- 3- 5- 7-  5 13+  4 -8
Curve Equation t Generators 81900bl1 [0,0,0,-17625,-1114675] 1 [164:637:1]
81900bm (2 curves)	0	2- 3- 5- 7- 13-	2- 3- 5- 7-  0 13-  3  2
Curve Equation t 81900bm1 [0,0,0,-15375,-976250] 1 81900bm2 [0,0,0,119625,11308750] 3
81900bn (2 curves)	0	2- 3- 5- 7- 13-	2- 3- 5- 7-  0 13-  6  2
Curve Equation t 81900bn1 [0,0,0,-6600,-116300] 1 81900bn2 [0,0,0,-240600,45420100] 3
81900bo (1 curve)	0	2- 3- 5- 7- 13-	2- 3- 5- 7-  2 13- -6  4
Curve Equation t 81900bo1 [0,0,0,-2298000,-1340820700] 1
81900bp (2 curves)	0	2- 3- 5- 7- 13-	2- 3- 5- 7-  3 13-  6  2
Curve Equation t 81900bp1 [0,0,0,13875,-464375] 1 81900bp2 [0,0,0,-143625,28200625] 3
81900bq (2 curves)	0	2- 3- 5- 7- 13-	2- 3- 5- 7-  4 13-  2 -6
Curve Equation t 81900bq1 [0,0,0,4591500,2028153125] 2 81900bq2 [0,0,0,-21075375,17299943750] 2
81900br (1 curve)	0	2- 3- 5- 7- 13-	2- 3- 5- 7-  5 13-  0  4
Curve Equation t 81900br1 [0,0,0,31875,2073125] 1

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