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72=(2*2)*(3*3)*2 因此 完全平方數(設為N*N)*2*72===(2*2)*(3*3)*(2*2)*(N*N) 就還是完全平方數 所以 N*N*2應該小於2006 也就是說,小於1003的完全平方數符合這個要求,一共是31個(32*32=1024就超出了)
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