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Google
Rank	Domain	PR	Backlinks	Pages in URL
1	primes.utm.edu	6	13000	38600
3	math.utah.edu	6	24200	78500
4	sciencenews.org	7	208000	43600
6	gadgets.boingboing.net	7	408000	10300
7	britannica.com	9	1450000	1210000
8	mersenne.org	6	24700	178
10	prime.isthe.com	-	269	105
11	news.bbc.co.uk	9	15200000	3360000
13	vnunet.com	6	1070000	388000
14	articles.latimes.com	6	159000	1450000

Yahoo
Rank	Domain	PR	Backlinks	Pages in URL
1	sizes.com	-
2	cbc.ca	8	1690000	2820000
3	unc.edu	8	1200000	1510000
4	news.bbc.co.uk	9	15200000	3360000
5	itwire.com	6	59900	87000
6	signonsandiego.com	4	748000	563000
7	newscientist.com	8	1330000	177000
8	brainpop.com	7	69400	4220
9	lost.co.nz	3	267	213
10	trap17.com	4	32900	239000

Bing
Rank	Domain	PR	Backlinks	Pages in URL
1	primes.utm.edu	6	13000	38600
2	math.utah.edu	6	24200	78500
3	newscientist.com	8	1330000	177000
4	mathsisfun.com	6	18200	7320
5	sciencenews.org	7	208000	43600
6	brainpop.com	7	69400	4220
7	blogs.msdn.com	7	2320000	561000
8	unc.edu	8	1200000	1510000
9	prime.isthe.com	-	269	105
10	mersenne.org	6	24700	178

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