Tuesday, September 16, 2014

Solving a Riddle of Primes - NYTimes.com

Solving a Riddle of Primes - NYTimes.com:

"Three and five are prime numbers — that is, they are divisible only by 1 and by themselves. So are 5 and 7. And 11 and 13. And for each of these pairs of prime numbers, the difference is 2."

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