Math Problem Statement
提问:x²+y²=n其中x、y、n均为自然数,方程有解得充分必要条件是什么? 我一开始的想法:是n为完全平方数,当x或者y中一个为0,问题就等价于x²=n或者y²=n(均为自然数)有解的充要条件是什么?显然是完全平方数。 但是这里有个问题,1²+1²=2; 1²+2²=5; 1²+3²=10; 2²+3²=13 ... ... 这些都不是完全平方数,所以我之前认为的完全平方数是充要条件显然不正确,应该如何完善?是否能从数论中,比如勾股数中得到一些启发?
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Math Problem Analysis
Mathematical Concepts
Number Theory
Representation as Sum of Two Squares
Fermat's Two-Square Theorem
Pythagorean Triples
Formulas
n = x^2 + y^2
Prime factorization of n
Conditions based on primes of the form 4k+3
Theorems
Fermat's Two-Square Theorem
Properties of Numbers Representable as Sum of Two Squares
Suitable Grade Level
University level, Number Theory Course
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