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|---|---|---|---|---|
| Rank | Domain | PR | Backlinks | Pages in URL |
| 1 | cut-the-knot.org | 6 | 30800 | 37000 |
| 3 | freepatentsonline.com | 7 | 91300 | 12500000 |
| 5 | qbyte.org | 6 | 3220 | 546 |
| 7 | jd2718.wordpress.com | 5 | 23500 | 3330 |
| 9 | geocities.com | 9 | 21200000 | 10200000 |
| 10 | olimu.com | 5 | 6470 | 2150 |
| 11 | maa.org | 8 | 74600 | 36300 |
| 12 | cs.purdue.edu | 7 | 40900 | 32100 |
| 14 | theory.stanford.edu | 6 | 7930 | 5020 |
| 15 | illuminations.nctm.org | 6 | 37500 | 2460 |
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|---|---|---|---|---|
| Rank | Domain | PR | Backlinks | Pages in URL |
| 1 | dictionary.reference.com | 8 | 2270000 | 5910000 |
| 2 | cut-the-knot.org | 6 | 30800 | 37000 |
| 4 | qbyte.org | 6 | 3220 | 546 |
| 5 | demonstrations.wolfram.com | 7 | 54800 | 15100 |
| 6 | armoredpenguin.com | 4 | 3500 | 8960 |
| 7 | discoverspace.org | 4 | 78 | 89 |
| 9 | euler.slu.edu | 5 | 4390 | 2870 |
| 11 | humboldt.edu | 7 | 77500 | 86200 |
| 12 | fastgeometry.com | 4 | 23 | 13 |
| 13 | cs.purdue.edu | 7 | 40900 | 32100 |
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|---|---|---|---|---|
| Rank | Domain | PR | Backlinks | Pages in URL |
| 1 | cut-the-knot.org | 6 | 30800 | 37000 |
| 3 | origomath.com | 3 | 89 | 222 |
| 4 | edhelper.com | 6 | 41000 | 35900 |
| 5 | mathsisfun.com | 6 | 18200 | 7320 |
| 6 | demonstrations.wolfram.com | 7 | 54800 | 15100 |
| 7 | qbyte.org | 6 | 3220 | 546 |
| 9 | geocities.com | 9 | 21200000 | 10200000 |
| 10 | wordassociates.com | 2 | 38 | 27 |
| 11 | mathforum.org | 8 | 115000 | 375000 |
| 12 | trincoll.edu | 7 | 75900 | 29900 |
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