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Sum Divisibility Dilemma (Posted on 2014-03-18) Difficulty: 3 of 5
Determine a general formula (in terms of n) for the sum of the first n positive integers that are not divisible by 5.

No Solution Yet Submitted by K Sengupta    
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Some Thoughts re(2): Different formula, same result | Comment 5 of 6 |
(In reply to re: Different formula, same result by tomarken)

Well, thanks for the kind words, but I am not convinced that mine is any more elegant than yours.  Yours uses smaller numbers, so the pencil and paper calculation might actually be easier.
  Posted by Steve Herman on 2014-03-18 16:48:27

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