In this note I have mentioned that it is not possible that \(p_1^2+p_2^2=p_3^2\) where \(p_1,p_2,p_3\) are all primes
I have spend some more time on it and got another proof for it which I consider the best one:
For p1,p2,p3 all of which are primes it is not possible to have p12+p22=p32
Proof:
Let us assume there exists primes p1,p2,p3∣p12+p22=p32p12=p32−p22=(p3−p2)(p3+p2)
Now pairwise factors of p12 are (p12,1),(p1,p1) now if p3−p2=p1⇒p3−p2=p1=p3+p2⇒p2=0 which is not possible
∴p3−p2=1;p3+p2=p12∵p3−p2<p3+p2
But this also leads to contradiction because according to it p3=p2+1 which is not possible for p3>3
Therefore no solution exists for p3>3 if p3=3⇒p2=2 but p32−p22=32−22=5⇒p12=5⇒p1=5,−5 which also leads to contradiction
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Thank you so much! @Zakir Husain