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Just showing those entries submitted by 'Morse': (Click here to show all) This is one of only 2 fourdigit composite numbers which, when used as "K" in Leonhard Euler's formula for generating many primes (X^2)+X+K, in which Euler originally used K=41, yields more primes than composites for the first 1,000 integer values of X. Note that the only other 4digit composite number to yield 50+% primes in Euler's formula is 6887. [Morse]
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