Math::NumSeq::ReverseAdd -- steps of the reverse-add algorithm


 use Math::NumSeq::ReverseAdd;
 my $seq = Math::NumSeq::ReverseAdd->new (start => 196);
 my ($i, $value) = $seq->next;


The reverse-add sequence from a given starting point. The digit reversal of a given value is added to make the next. For example start => 1,


At 16 the reversal is 61, adding those 16+61=77 is the next value. There's some interest in whether a palindrome like 77 is ever reached in the sequence, but the sequence here continues on forever.

The default is digits reversed in decimal, but the radix parameter can select another base.


See "FUNCTIONS" in Math::NumSeq for behaviour common to all sequence classes.

$seq = Math::NumSeq::ReverseAdd->new (start => $n)
$seq = Math::NumSeq::ReverseAdd->new (start => $n, radix => $r)

Create and return a new sequence object.

Random Access

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

Return the $ith value in the sequence.


Math::NumSeq, Math::NumSeq::ReverseAddSteps



Copyright 2011, 2012, 2013, 2014, 2016, 2019, 2020 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 <>.