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Page last updated at 10:44 GMT, Friday, 17 April 2009 11:44 UK

Marcus du Sautoy: Perfect Primes

Mathematician Marcus du Sautoy tells BBC Radio 4's More or Less about the beautiful relationship between perfect numbers and Mersenne primes.

More or Less is broadcast on BBC Radio 4 on Fridays at 1330 GMT and repeated on Sundays at 2000 GMT. To listen again, visit the website or subscribe to the podcast .

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