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OpenStudy (anonymous):
I need help on how to prove this: for all positive integers x, x^2+x+41 is a prime.
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OpenStudy (anonymous):
this is not true
OpenStudy (anonymous):
take x=40
OpenStudy (anonymous):
40^2 + 40 + 41 = 1681
OpenStudy (anonymous):
1681 = 41^2
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