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#1 2007-09-11 00:39:29

haruka-san
Member
Registered: 2006-11-08
Posts: 205

Pairs of Primes

Find all pairs of primes p and q satisfying p-q=3

wink


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#2 2007-09-11 01:45:26

pi man
Member
Registered: 2006-07-06
Posts: 251

Re: Pairs of Primes

The difference between p and q is 3.  Therefore one of the primes has to be even and the other has to be odd.   The only even prime is 2.   And 5 is also a prime so the only pair of primes with a difference of 3 is 2 and 5.

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