#!/usr/bin/perl -w
# Copyright 2012 Kevin Ryde
# This file is part of Math-PlanePath.
#
# Math-PlanePath 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-PlanePath 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-PlanePath. If not, see .
use 5.010;
use strict;
use warnings;
use Math::PlanePath::SquareSpiral;
# uncomment this to run the ### lines
#use Smart::Comments;
{
require Math::Prime::XS;
my @primes = (0,
Math::Prime::XS::sieve_primes (1000));
my $path = Math::PlanePath::SquareSpiral->new;
foreach my $y (reverse -4 .. 4) {
foreach my $x (-4 .. 4) {
my $n = $path->xy_to_n($x,$y);
my $p = $primes[$n] // '';
printf " %4d", $p;
}
print "\n";
}
exit 0;
}