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Posted to issues@commons.apache.org by "Heinrich Bohne (JIRA)" <ji...@apache.org> on 2019/07/23 21:50:00 UTC

[jira] [Created] (NUMBERS-133) Speed up Primes.nextPrime(int)

Heinrich Bohne created NUMBERS-133:
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             Summary: Speed up Primes.nextPrime(int)
                 Key: NUMBERS-133
                 URL: https://issues.apache.org/jira/browse/NUMBERS-133
             Project: Commons Numbers
          Issue Type: Improvement
          Components: primes
    Affects Versions: 1.0
            Reporter: Heinrich Bohne


The method {{Primes.nextPrime(int)}} can use the same algorithm to skip multiples of certain primes as {{SmallPrimes.boundedTrialDivision(int, int, List<Integer>)}} uses, instead of hard-coding the alternating increment of the trial candidate into a loop.

Also, if the argument of the method is smaller than or equal to the 512th prime number, the method can just infer the next higher prime number directly from the array {{SmallPrimes.PRIMES}} without performing any calculations.



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