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A Perplexing (Prime) Puzzle (Posted on 2007-06-05) Difficulty: 4 of 5
Consider the quadruplets (p,q,r,s) of positive integers with p>q>r>s, and satisfying pr+qs= (q+s+p-r)(q+s-p+r).

Is it ever the case that pq+rs is a prime number?

See The Solution Submitted by K Sengupta    
Rating: 4.0000 (3 votes)

Comments: ( You must be logged in to post comments.)
  Subject Author Date
Might be correct!Praneeth Yalavarthi2007-07-11 12:16:55
Hints/TipsHintK Sengupta2007-06-29 12:52:26
Helpful Observation?Tommy2007-06-28 14:23:15
More number crunchingBrian Smith2007-06-07 22:08:55
Some number crunchingBrian Smith2007-06-07 00:34:43
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