Package de.tilman_neumann.jml.factor.squfof

Class SquFoF31Preload

java.lang.Object
de.tilman_neumann.jml.factor.FactorAlgorithm
de.tilman_neumann.jml.factor.squfof.SquFoF31Preload
public class SquFoF31Preload
extends FactorAlgorithm
Shanks' SQUFOF algorithm, 31-bit version. This version works without fail for N <= 2^52 and is faster than SquFoF63 for N <= 2^51. This version preloads the square-free sequence, but that makes hardly a difference.

  • Field Summary

    Fields inherited from class de.tilman_neumann.jml.factor.FactorAlgorithm

    NUM_PRIMES_FOR_31_BIT_TDIV, tdivLimit

  • Constructor Summary

    Constructors
    Constructor Description
    SquFoF31Preload()  

  • Method Summary

    Modifier and Type Method Description
    long findSingleFactor​(long N)
    Find a factor of the given composite N.

    Warning: This method will not return when called with a prime argument.
    java.math.BigInteger findSingleFactor​(java.math.BigInteger N)
    Find a single factor of the given N, which is composite and odd.
    java.lang.String getName()  
    static void main​(java.lang.String[] args)
    Test.
    protected java.lang.Long test​(int Q_ip1)  

    Methods inherited from class de.tilman_neumann.jml.factor.FactorAlgorithm

    factor, factor, getDefault, searchFactors

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

    • SquFoF31Preload

      public SquFoF31Preload()

  • Method Details

    • getName

      public java.lang.String getName()
      Specified by:
      getName in class FactorAlgorithm
      Returns:
      The name of the algorithm, possibly including important parameters.

    • findSingleFactor

      public java.math.BigInteger findSingleFactor​(java.math.BigInteger N)
      Description copied from class: FactorAlgorithm
      Find a single factor of the given N, which is composite and odd.
      Specified by:
      findSingleFactor in class FactorAlgorithm
      Parameters:
      N - number to be factored.
      Returns:
      factor

    • findSingleFactor

      public long findSingleFactor​(long N)
      Find a factor of the given composite N.

      Warning: This method will not return when called with a prime argument.
      Parameters:
      N - composite integer
      Returns:
      factor of N

    • test

      protected java.lang.Long test​(int Q_ip1)

    • main

      public static void main​(java.lang.String[] args)
      Test.
      Parameters:
      args - ignored