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<?php error_reporting(E_ALL); ini_set('display_errors', 1); const GIVEN = 3; $sum = 1; for ($k = 1; $k <= 20; $k++) { $sum += pow(GIVEN, $k); } echo $sum; echo PHP_EOL . PHP_EOL . '=====' . PHP_EOL . PHP_EOL; $s = 0; $p = 1; for ($i = 1; $i <= 20; $i++) { echo $i . ' ' . $p . PHP_EOL; for ($k = 1; $k <= $i; $k++) { $p = $p * 3; } $s = $s+$p; } echo $s;