[math-fun] Proof or idea for proof needed

Just got from unknown guy. Any ideas? -------- Пересылаемое сообщение -------- От кого: grafix@csl.pl   Кому: zakseidov@yahoo.com Дата: Среда, 20 июля 2016, 0:08 +03:00 Тема: Proof or idea for prrof needed Dear Zak, Do You know how to prove that z(m,n) for integer m,n defined as z=(n (2 m + 11 n)^5)/(64 (m^2 + 261 m n - 2501 n^2)^2 (m^2 + n^2)) can't be integer with trivial exception {z=0, m=-11,n=2} or {z=0, m=11,n=-2} Best wishes Artur Jasinski, Poland ---------------------------------------------------------------------- ----------------------------------------------------------------------