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Mathematics 77 Online
OpenStudy (anonymous):

I need help on how to prove this: for all positive integers x, x^2+x+41 is a prime.

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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