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Peter John Acklam > Math-Big > Math::Big::Factors

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# CPAN RT

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Module Version: 1.14

# NAME

Math::Big::Factors - factor big numbers into prime factors using different algorithmns

# SYNOPSIS

```    use Math::Big::Factors;

\$wheel      = wheel (4);                    # prime number wheel of 2,3,5,7
print \$wheel->[0],\$wheel->[1],\$wheel->[2],\$wheel->[3],"\n";

@factors    = factors_wheel(19*71*59*3,1);  # using prime wheel of order 1
@factors    = factors_wheel(19*71*59*3,7);  # using prime wheel of order 7```

# REQUIRES

perl5.005, Exporter, Math::BigInt, Math::BigFloat, Math::Big

# EXPORTS

Exports nothing on default, but can export `wheel()`, `factor()`, `factors_wheel()`;

# DESCRIPTION

This module contains some routines that may come in handy when you want to factor big numbers into prime factors. examples.

# FUNCTIONS

wheel()
`        \$wheel = wheel(\$o);`

Returns a reference to a prime wheel of order \$o. This is used for factoring numbers into prime factors.

A wheel of order 7 saves about 50% of all trial divisions over the normal trial division factor algorihmn. Higher oder will save less and less, but a wheel of size 8 takes so long to compute and much memory that it is not worth the effort, limiting wheels of practicable size to order 7. For very small numbers the computation of the wheel of order 7 may actually take longer than the factorization, but anything that has more than 10 digits will usually benefit from order 7.

factors_wheel()

Factor a number into its prime factors and return a list of factors.

# BUGS

Please report any bugs or feature requests to `bug-math-big at rt.cpan.org`, or through the web interface at https://rt.cpan.org/Ticket/Create.html?Queue=Math-Big (requires login). We will be notified, and then you'll automatically be notified of progress on your bug as I make changes.

# SUPPORT

You can find documentation for this module with the perldoc command.

`    perldoc Math::Big::Factors`

You can also look for information at: