Suppose a and b are positive integers. We all know that aČ+2ab+bČ is a perfect square. Give an example where also aČ+ab+bČ is a perfect square. How many such examples exist?
Expanding on yesterday's work, it turns out the the two formulas I found will generate base pairs for any odd number, not just primes.
To recap, choose any odd number, a:
b_1 = a^2  ((a+1)/2)^2
b_2 = ((a1)/2)^2  1
The pairs (a, b_1) and (a, b_2) will both produce a perfect square when a^2 + ab + b^2 is calculated.
I'll try to find a formula that will generate the base pairs where 'a' is even...

Posted by tomarken
on 20060426 10:03:03 