function nextPrime($x)
{
// Precondition: $x is prime or 1. (Handy for initialization of an iterator.)
if ($x == 1) {
return 2;
}
if (isDivisible($x, 2)) {
--$x;
}
do {
$x += 2;
} while (!isPrime($x));
return $x;
}
<h1>Question 005</h1>
<!--2520 is the smallest number that can be divided by each of the numbers from 1 to 10 without any remainder.-->
<!--What is the smallest positive number that is evenly divisible by all of the numbers from 1 to 20?-->
<?php
$a = 2520;
//echo $i;
function isDivisible($a)
{
foreach (range(11, 20) as $number) {
if ($a % $number == 0) {
continue;
} else {
return false;
}
}
return true;
}
while (isDivisible($a) == false) {
$a += 2520;
}
echo $a . '<br>';
