NAME
Math::NumSeq::AlmostPrimes  semiprimes and other fixed number of prime factors
SYNOPSIS
use Math::NumSeq::AlmostPrimes;
my $seq = Math::NumSeq::AlmostPrimes>new (factor_count => 2);
my ($i, $value) = $seq>next;
DESCRIPTION
The sequence of numbers having a given number of prime factors. The default is the semiprimes factor_count => 2
giving products of two primes P*Q, which is 4,6,9,10,14,15,etc. For example 15 because 15=3*5.
factor_count => $c
controls how many prime factors are to be used. 1 is the primes themselves (the same as Math::NumSeq::Primes). Or for example factor count 4 the sequence is 16,24,36,40,54,60,etc, eg. 60=2*2*3*5.
multiplicity => 'distinct'
asks for products of distinct primes. For the default 2 factors this means no squares like 4=2*2, leaving 6,10,14,15,21,etc. For other factor count it eliminates any repeated factors, so for example factor count 4 becomes 210,330,390,462,510,546,etc. The first in the sequence is the primorial 2*3*5*7=210.
FUNCTIONS
See "FUNCTIONS" in Math::NumSeq for behaviour common to all sequence classes.
$seq = Math::NumSeq::AlmostPrimes>new ()

Create and return a new sequence object.
$bool = $seq>pred($value)

Return true if
$value
is an almostprime, ie. it has exactlyfactor_count
many prime factors, and ifdistinct
is true then all those factors different.This check requires factorizing
$value
and in the current code a hard limit of 2**32 is placed on values to be checked, in the interests of not going into a nearinfinite loop.
SEE ALSO
Math::NumSeq, Math::NumSeq::Primes, Math::NumSeq::PrimeFactorCount
HOME PAGE
http://user42.tuxfamily.org/mathnumseq/index.html
LICENSE
Copyright 2010, 2011, 2012 Kevin Ryde
MathNumSeq is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version.
MathNumSeq is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with MathNumSeq. If not, see <http://www.gnu.org/licenses/>.