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Old 2008-04-27, 17:12   #9
henryzz
Just call me Henry
 
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"David"
Sep 2007
Cambridge (GMT/BST)

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Quote:
Originally Posted by petrw1 View Post
I would consider saving in an array all numbers (prime or otherwise) encountered so far. Whenever your current chain matches one of those you can skip to the next chain knowing it will eventually end in 3.

I suspect that most will abort a lot sooner.

I believe the astutue programmers call this memoization.
i have programed this
unfortunatly it only takes off a fifth of the time
are there any more suggestion?
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