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<?php function primeSum($n, $k) { $primeNumbers = []; for ($i = 2; $i <= $n; $i++) { $found = true; for ($j = 2; $j < $i; $j++) { if ($i % $j === 0) { $found = false; break; } } if ($found) { $primeNumbers[$i] = 1; } } var_dump($primeNumbers); } primeSum(20, 10);
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
array(8) { [2]=> int(1) [3]=> int(1) [5]=> int(1) [7]=> int(1) [11]=> int(1) [13]=> int(1) [17]=> int(1) [19]=> int(1) }
preferences:
44.65 ms | 1985 KiB | 4 Q