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**For which primes "P" is the following true?**

the function f(x) = x(x - 1) + p gives you a prime number for all x < p

I've tried this with 5,11, and 41, but it doesn't work for 7 since 5(5-1) + 7 is not a prime.

Btw, this isn't homework or anything, just a curiosity.