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Fast Triangular Numbers

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Explanation of the method used here in the URL.

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  1. <?php
  2. /*  
  3.  *  Due to being a simple piece of mathematics, my triangular number function is likely
  4.  *  exempt from copyright, but just in case I eschew all copyright and give it entirely
  5.  *  to the public domain.
  6.  *      --Joey Sabey
  7.  */
  8.  
  9. function triangularNumber($_x) {
  10.     return (($_x / 2) + 0.5) * $_x;
  11. }
  12.  
  13. ?>

URL: http://www.curiousmath.com/index.php?name=News&file=article&sid=95

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