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Some later nodes that refer to this trick are Re: Simple primality testing, Re^2: The Oldest Plays the Piano, Re: Calculate prime factors for a given number in a perl one-liner, Re: is it prime?.

Update 2015-10-22: See also "How does this regular expression work?" (2010-07) question on StackOverflow which asks about a similar regex in the article "A regular expression to check for prime numbers" (2007-03) by Avinash Meetoo


In reply to Re: prime factorization using base 1 by ambrus
in thread prime factorization using base 1 by tye

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