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On Being Perfect (Numbers)

Mario Livio | Posted 06.02.2013 | Science
Mario Livio

A number is called perfect if it is precisely equal to the sum of all the numbers that divide it exactly (excluding the number itself). In this sense, it's neither too large nor too small; it's just "perfect."

Mathematician Makes Huge Prime Number Discovery

Posted 02.07.2013 | Science

By: Tia Ghose, LiveScience Staff Writer Published: 02/05/2013 11:57 AM EST on LiveScience The largest prime number yet has been discovered — and ...