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Consecutive Integer Series (Posted on 2007-05-14) Difficulty: 3 of 5
In the infinite series 1, 2, 2, 3, 3, 3, 4, 4, 4, 4, 4, 5... each positive integer k appears k times in consecutive order.

Write a formula for the sum of the first n terms of the series.

See The Solution Submitted by Dennis    
Rating: 4.5000 (2 votes)

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Solution A formula | Comment 1 of 12
Sigma [i=0 to k] FLOOR(1/2 + SQRT(2k))
  Posted by Dej Mar on 2007-05-14 15:09:16
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