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summationofprimes.php
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summationofprimes.php
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<?php
/*
* summationofprimes.php
*
* Copyright 2015 Ajay Bhatia <prof.ajaybhatia@gmail.com>
*
* This program 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 2 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*
*
*/
function isPrime($n) {
for ($i = 2; $i <= sqrt($n); $i++)
if ($n % $i == 0)
return false;
return true;
}
$sum = 0;
for ($i = 2; $i <= 2000000; $i++)
if (isPrime($i))
$sum += $i;
echo "Sum of prime numbers till 2 million is " . $sum . "\n";
?>