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 Google |
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|---|---|---|---|---|
| Rank | Domain | PR | Backlinks | Pages in URL |
| 1 | mathforum.org | 8 | 115000 | 375000 |
| 3 | cut-the-knot.org | 6 | 30800 | 37000 |
| 4 | en.wikipedia.org | 8 | 61800000 | 3750000 |
| 5 | math.utah.edu | 6 | 24200 | 78500 |
| 7 | blackwasp.co.uk | 3 | 1700 | 361 |
| 8 | lexington1.net | 4 | 2250 | 2160 |
| 9 | primes.utm.edu | 6 | 13000 | 38600 |
| 10 | hbmeyer.de | 3 | 276 | 144 |
| 12 | jimloy.com | 5 | 8740 | 2510 |
| 13 | videojug.com | 7 | 272000 | 347000 |
 Yahoo |
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|---|---|---|---|---|
| Rank | Domain | PR | Backlinks | Pages in URL |
| 1 | en.wikipedia.org | 8 | 61800000 | 3750000 |
| 2 | mathforum.org | 8 | 115000 | 375000 |
| 3 | nist.gov | 8 | 597000 | 576000 |
| 4 | primes.utm.edu | 6 | 13000 | 38600 |
| 5 | jc-schools.net | 4 | 17900 | 9220 |
| 6 | jimloy.com | 5 | 8740 | 2510 |
| 7 | cut-the-knot.org | 6 | 30800 | 37000 |
| 8 | algorithmist.com | 4 | 892 | 1110 |
| 9 | math.utah.edu | 6 | 24200 | 78500 |
| 10 | 1729.com | 5 | 955 | 274 |
 Bing |
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|---|---|---|---|---|
| Rank | Domain | PR | Backlinks | Pages in URL |
| 1 | mathforum.org | 8 | 115000 | 375000 |
| 2 | math.utah.edu | 6 | 24200 | 78500 |
| 3 | primes.utm.edu | 6 | 13000 | 38600 |
| 4 | nist.gov | 8 | 597000 | 576000 |
| 6 | mathworld.wolfram.com | 9 | 352000 | 31300 |
| 7 | onlinemathlearning.com | 4 | 526 | 1190 |
| 8 | stagecast.com | 5 | 1250 | 717 |
| 9 | fortran.com | |||
| 10 | daviddarling.info | 3 | 27200 | 15300 |
| 11 | support.microsoft.com | 8 | 3610000 | 1290000 |
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