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Take Biquadratic, Get Prime (Posted on 2007-06-10)

Determine all possible positive primes m such that 7m⁴ – 3942 is a positive prime number.

See The Solution Submitted by K Sengupta

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solution

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Only m=5. For all other primes (necessarily odd) the function is divisible by 5 For m=5 the function gives a value of 433, which is prime.

Posted by xdog on 2007-06-11 10:54:54

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