NAME

App::MathImage::NumSeq::CollatzSteps -- steps in the "3n+1" problem

SYNOPSIS

use App::MathImage::NumSeq::CollatzSteps;
my $seq = App::MathImage::NumSeq::CollatzSteps->new;
my ($i, $value) = $seq->next;

DESCRIPTION

The number of steps it takes to reach 1 by the Collatz "3n+1" problem,

n -> / 3n+1  if n odd
     \ n/2   if n even

FUNCTIONS

$seq = App::MathImage::NumSeq::CollatzSteps->new (key=>value,...)

Create and return a new sequence object.

$value = $seq->ith($i)

Return the number of steps to take $i down to 1.

$bool = $seq->pred($value)

Return true if $value occurs as a step count. This is true for any non-negative $value.

SEE ALSO

App::MathImage::NumSeq

HOME PAGE

http://user42.tuxfamily.org/math-image/index.html

LICENSE

Copyright 2011 Kevin Ryde

Math-Image 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-Image 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-Image. If not, see <http://www.gnu.org/licenses/>.