Math::NumSeq::DigitSum -- sum of digits, possibly with powering
use Math::NumSeq::DigitSum; my $seq = Math::NumSeq::DigitSum->new (radix => 10); my ($i, $value) = $seq->next;
The sum of digits in each i, so 0,1,...,9,1,2,..., etc. For example at i=123 the value is 1+2+3=6.
See "FUNCTIONS" in Math::NumSeq for behaviour common to all sequence classes.
$seq = Math::NumSeq::DigitSum->new ()
$seq = Math::NumSeq::DigitSum->new (radix => $r, power => $p)
Create and return a new sequence object. The default is decimal, with no powering, or radix
and/or power
parameters can be given.
$value = $seq->ith($i)
Return the sum of the digits of $i
, each raised to the given power
parameter.
$bool = $seq->pred($value)
Return true if $value
occurs as a sum of digits, which means simply $value >= 0
.
Math::NumSeq, Math::NumSeq::DigitLength, Math::NumSeq::DigitProduct, Math::NumSeq::DigitSumModulo
http://user42.tuxfamily.org/math-numseq/index.html
Copyright 2011, 2012, 2013, 2014 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/>.