Math::NumSeq::Primorials -- primorials 2*3*...*p[i]
use Math::NumSeq::Primorials; my $seq = Math::NumSeq::Primorials->new; my ($i, $value) = $seq->next;
The sequence of primorials, being the product of the first i many primes, 2*3*5*...*p[i].
1, 2, 6, 30, 210, ... starting i=0
See "FUNCTIONS" in Math::NumSeq for behaviour common to all sequence classes.
$seq = Math::NumSeq::Primorials->new ()
Create and return a new sequence object.
$value = $seq->ith($i)
Return 2*3*5*...*p[$i]
. For $i==0
this is considered an empty product and the return is 1.
$bool = $seq->pred($value)
Return true if $value
is equal to 2*3*5*...*p[i]
for number of primes.
$i = $seq->value_to_i_floor($value)
Return the index i of $value
or of the next primorial below $value
.
$i = $seq->value_to_i_estimate($value)
Return an estimate of the i corresponding to $value
.
Math::NumSeq, Math::NumSeq::Factorials
"pn_primorial" in Math::Prime::Util
http://user42.tuxfamily.org/math-numseq/index.html
Copyright 2010, 2011, 2012, 2013, 2014 Kevin Ryde
Math-NumSeq 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.
Math-NumSeq 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.
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