Math::NumSeq::Emirps -- primes backwards and forwards
use Math::NumSeq::Emirps; my $seq = Math::NumSeq::Emirps->new; my ($i, $value) = $seq->next;
The "emirps", being numbers which are primes backwards and forwards. For example 157 is an emirp because both 157 and its reverse 751 are primes. Prime palindromes are excluded.
The default base 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::Emirps->new ()
$seq = Math::NumSeq::Emirps->new (radix => 16)
Create and return a new sequence object.
$bool = $seq->pred($value)
Return true if $value
is an emirp, meaning it and its digit reversal (in the radix
) are both primes.
Math::NumSeq, Math::NumSeq::Primes
http://user42.tuxfamily.org/math-numseq/index.html
Copyright 2010, 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.
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