Math::NumSeq::Palindromes -- palindrome numbers like 15351


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


The palindrome numbers which read the same backwards and forwards.

    0 .. 9, 11, 22, ..., 99, 101, 111, 121, ... 191, 202, ...
    # starting i=1 value=0

The default is decimal or the radix parameter can select another base.


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

$seq = Math::NumSeq::Palindromes->new ()
$seq = Math::NumSeq::Palindromes->new (radix => $r)

Create and return a new sequence object.



Move the current sequence position to $i. The next call to next() will return $i and corresponding value.

Random Access

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

Return the $i'th palindrome number.

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

Return true if $value is a palindrome, ie. its digits read the same forwards and backwards (in the given radix).


Math::NumSeq, Math::NumSeq::Repdigits



Copyright 2010, 2011, 2012, 2013, 2014, 2016, 2019, 2020, 2021 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 <>.