<?php $arr = array( '2' => 0, '3' => 0, '4' => 0, '5' => 0 ); for ($i = 1; $i <= 120; $i++) { $sum = 0; for ($j = 1; $j <= $i; $j++) { $sum += $j; } if ($sum % 2 == 0) { $arr[2]++; } if ($sum % 3 == 0) { $arr[3]++; } if ($sum % 4 == 0) { $arr[4]++; } if ($sum % 5 == 0) { $arr[5]++; } } asort($arr); $arr = array_keys($arr); echo 'answer: ' . $arr[0]; ?>
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