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@ 2013-03-13T15:45:56Z

<?php function x($n){for($i=1;$i<=$n;$i++){$n%$i==0&&$i!=$n?$f[]=$i:0;}printf(array_sum($f)==$n?'P':'I');}x(28);

Output
Performance
VLD
References
Branches

array_sum: documentation ( source)
printf: documentation ( source)

preferences:dark modelive preview

41.76 ms | 402 KiB | 5 Q