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Two Geometric Series (Posted on 2003-07-14) Difficulty: 2 of 5
Find a geometric series of 3 or more positive integers, starting with 1, such that its sum is a perfect square.

See if you can find another such series.

See The Solution Submitted by Brian Smith    
Rating: 3.6667 (6 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
Solution 2 solutions | Comment 4 of 10 |
1 + 3 + 9 + 27 + 81 = 121 = 11^2
1 + 7 + 49 + 343 = 400 = 20^2
  Posted by exoticorn on 2003-07-14 06:48:05
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