APMO 1989
Posted: Mon Apr 09, 2012 9:16 pm
How to crack this one ?
Prove that the equation
\[6(6a^2 + 3b^2 + c^2) = 5n^2\]
has no solutions in integers except $a = b = c = n = 0$.
Prove that the equation
\[6(6a^2 + 3b^2 + c^2) = 5n^2\]
has no solutions in integers except $a = b = c = n = 0$.