NAME

Math::NumSeq::Pronic -- pronic numbers

SYNOPSIS

use Math::NumSeq::Pronic;
my $seq = Math::NumSeq::Pronic->new;
my ($i, $value) = $seq->next;

DESCRIPTION

The sequence of pronic numbers 2, 6, 12, 20, 30, etc, i*(i+1). These are twice the triangular numbers, and half way between perfect squares.

FUNCTIONS

$seq = Math::NumSeq::Pronic->new (key=>value,...)

Create and return a new sequence object.

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

Return $i*($i+1).

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

Return true if $value is a pronic number, ie. i*(i+1) for some i.

SEE ALSO

Math::NumSeq, Math::NumSeq::Squares, Math::NumSeq::Triangular

HOME PAGE

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

LICENSE

Copyright 2010, 2011 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/>.