What’s the equivalent of Mathematica’s Fu nction in Pari/Gp

Bonjour,

simple question, in mathematica, I can write something like this :
Solve[((25)^2 + x RSA260)/(y) == (Floor[RSA260^(1/2)] + 1)^2, {x, y}, 
Integers]
where RSA260 is variable, and it returns me a value of x and y for which 
the equation is true.

Given the intent is clear even without understand the Mathematica’s 
language, what’s the equivalent of this Paris/Gp given I can’t afford 
buying mathematica ?

Cordialement,