Math::NumSeq::DigitProduct -- product of digits
use Math::NumSeq::DigitProduct; my $seq = Math::NumSeq::DigitProduct->new (radix => 10); my ($i, $value) = $seq->next;
The products of the digits of i, for example at i=456 the value is 4*5*6=120. i=0 is treated as a single digit 0, so it's product is 0.
For binary (
radix => 2) the digits are all just 0 or 1 which means the product is 1 for numbers 0b1, 0b11, 0b111, etc, 2**k-1, or 0 otherwise.
See "FUNCTIONS" in Math::NumSeq for behaviour common to all sequence classes.
$seq = Math::NumSeq::DigitProduct->new ()
$seq = Math::NumSeq::DigitProduct->new (radix => $r)
Create and return a new sequence object. The default radix is 10, ie. decimal, or a
radixparameter can be given.
$value = $seq->ith($i)
Return the product of the digits of
$bool = $seq->pred($value)
Return true if
$valueis the product of some set of digits. This means its factors (prime factors) are all less than the radix, since nothing bigger can occur.
Copyright 2011, 2012, 2013, 2014, 2016, 2019 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/>.