What about \(x^2 -1?\)
Number Theory
Level
1
\(3^2- 1\) is not a prime number.
\(4^2 -1\) is not a prime number.
\(5^2-1\) is not a prime number.
\(6^2 -1\) is not a prime number.
\(7^2 -1\) is not a prime number.
\(8^2 -1\) is not a prime number.
Is it true that \(x^2 -1\) is never a prime number for all positive integers \(x \gt 2\)?
by
Munem Sahariar