Find all 3-digit numbers that are equal to the sum of the cubes of the digits in the number.
<? // loop through all three digit numbers for ($n = 111; $n <= 999; $n++) { // convert to string settype($n, 'string'); // add the cubes together and see if they are the same as the original number if (pow($n[0], 3) + pow($n[1], 3) + pow($n[2], 3) == $n) // if so, add it to the array $narcissistic_numbers[] = $n; } // show all the numbers that match the rule echo implode(', ', $narcissistic_numbers);?>Which produces:
153, 370, 371, 407