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8621 (another Prime Pages' Curiosity) |
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This is one of only 2 four-digit 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 4-digit composite number to yield 50+% primes in Euler's formula is 6887. [Morse]
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