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  1. Recursive Digit Sum
  2. Discussions

Recursive Digit Sum

  • douglas_pasqua
     + 0 comments

    php

    function superDigit($n, $k) {
    $x = array_sum(str_split($n)) * $k;

    while ($x >= 10) {
        $x = array_sum(str_split($x));
    }

    return $x;
}