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 the behaviour common to all path 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 anything bigger cannot occur.
Copyright 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/>.