Fermat's Theorem: A Math Problem and the Smart Boy Who Proved It Wrong

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SUMMARY

A computer scientist claimed to have proven Fermat's Last Theorem for the numbers x=2233445566, y=7788990011, and z=9988776655. During a press conference, a 10-year-old boy identified a flaw in the scientist's calculations, asserting that the theorem cannot hold for these values. The boy's insight was based on the modular arithmetic properties of the numbers, specifically their congruences modulo 5. This incident highlights the importance of rigorous verification in mathematical proofs, especially when dealing with complex theorems like Fermat's.

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  • Understanding of Fermat's Last Theorem
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  • Study the implications of Fermat's Last Theorem in number theory
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from: http://www.math.utah.edu/~cherk/puzzles.html
Fermat, computers, and a smart boy
A computer scientist claims that he proved somehow that the Fermat theorem is correct for the following 3 numbers:

x=2233445566,
y=7788990011,
z=9988776655

He announces these 3 numbers and calls for a press conference where he is going to present the value of N (to show that

x^N + y^N = z^N

and that the guy from Princeton was wrong). As the press conference starts, a 10-years old boy raises his hand and says that the respectable scientist has made a mistake and the Fermat theorem cannot hold for those 3 numbers. The scientist checks his computer calculations and finds a bug.

How did the boy figure out that the scientist was wrong?

I am stumped, I noticed the pattern in the digits of the numbers, but I do not see how I can link that to the possibility of forming such a statement with those numbers when n is greater than 2.
 
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x==1Mod 5, Y==1 Mod 5, Z==0 Mod 5.
 

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