Math::NumSeq::Perrin -- Perrin sequence
use Math::NumSeq::Perrin; my $seq = Math::NumSeq::Perrin->new; my ($i, $value) = $seq->next;
The Perrin sequence,
3, 0, 2, 3, 2, 5, 5, 7, 10, 12, 17, 22, 29, 39, 51, etc
which is the recurrence
P(i) = P(i-2) + P(i-3)
starting from 3,0,2. So for example 29 is 12+17.
12, 17, 22, 29 | | ^ | | | +---+---add-+
See "FUNCTIONS" in Math::NumSeq for behaviour common to all sequence classes.
$seq = Math::NumSeq::Perrin->new (length => $integer)
Create and return a new sequence object.
$value = $seq->ith($i)
Return the $i
'th value from the sequence.
$i = $seq->value_to_i_estimate($value)
Return an estimate of the i corresponding to $value
.
Math::NumSeq, Math::NumSeq::Fibonacci
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/>.