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Old 2020-05-23, 14:15   #8
paulunderwood
 
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Sep 2002
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Quote:
Originally Posted by kriesel View Post
That number is composite (not prime) by definition. ba for b>1, a>1, a and b integer, is composite; b is a factor. This may win the prize for most obviously NOT prime.
https://www.mersenneforum.org/showpo...65&postcount=3
It also happens to have a superficial relationship to the largest known Mersenne prime, 282589933-1, whose exponent is 20M less.
See also, for the perfect record of predicting large primes,by various means, https://www.mersenneforum.org/showpo...04&postcount=5
The "8" --> "10" in the exponent would be beyond expectation. It would take a day on a GPU you to dismiss this claim, assuming P-1 does not turn up a factor.
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