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Math::NumSeq::CullenNumbers -- Cullen numbers i*2^i+1
use Math::NumSeq::CullenNumbers; my $seq = Math::NumSeq::CullenNumbers->new; my ($i, $value) = $seq->next;
The Cullen numbers i*2^i+1 starting from i=0,
1, 3, 9, 25, 65, 161, 385, 897, 2049, 4609, 10241, ...
See "FUNCTIONS" in Math::NumSeq for behaviour common to all sequence classes.
$value = $seq->ith($i)
$i * 2**$i + 1.
$bool = $seq->pred($value)
Return true if
$valueis a Cullen number, ie. is equal to i*2^i+1 for some i.
$i = $seq->value_to_i_estimate($value)
Return an estimate of the i corresponding to
Copyright 2011, 2012, 2013 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/>.