Determine all possible integer solutions, whether positive or negative, to this equation:
5y^{4} + 2560y^{2} = x^{5}  65536
x = 16, y = 16 or x = 16, y = 16 (x has to be positive, but y could go either way, of course)
I wish I had some formal mathematical proof for this, but I don't, I'll leave that to the smart people. I sort of happened upon it by accident, noticing that 2560 = 10(16^2) and 65536 = 16^4. I figured if x or y was 16 it would be easy to simplify...turns out it was.
One of those I just "saw", can't really explain the inspiration. Just figured I'd check out the "16" theme, normally this is the type of puzzle I won't even try  I'll wait for someone else to show me how it's done. :)

Posted by tomarken
on 20060315 15:15:43 