Math::NumSeq::Primes -- prime numbers
use Math::NumSeq::Primes; my $seq = Math::NumSeq::Primes->new; my ($i, $value) = $seq->next;
The prime numbers, not divisible by anything except themselves and 1.
2, 3, 5, 7, 11, 13, 17, 19, ... starting i=1
Currently this is implemented with Math::Prime::XS
generating blocks of primes with a sieve of Eratosthenes. The result is reasonably progressive. On a 32-bit system there's a hard limit at 2^31 (though even approaching that takes a long time to calculate).
See "FUNCTIONS" in Math::NumSeq for behaviour common to all sequence classes.
$seq = Math::NumSeq::Primes->new ()
Create and return a new sequence object.
$bool = $seq->pred($value)
Return true if $value
is a prime.
In the current code a hard limit of 2**32 is placed on the $value
to be checked, in the interests of not going into a near-infinite loop.
$i = $seq->value_to_i_estimate($value)
Return an estimate of the i corresponding to $value
. $value
can be any size, it's not limited as in pred()
. See "Value to i Estimate" below.
In the current code the number of count of primes up to value is estimated by the well-known asymptotic
i ~= value/log(value)
Math::NumSeq, Math::NumSeq::TwinPrimes, Math::NumSeq::SophieGermainPrimes, Math::NumSeq::Emirps
Math::Prime::XS, Math::Prime::TiedArray, Math::Prime::FastSieve, 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.
You should have received a copy of the GNU General Public License along with Math-NumSeq. If not, see <http://www.gnu.org/licenses/>.