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.

I guess I can cheat and say 1 + 1 + 1 + 1 is such a geometric series, as well as 1 + (9 times), but I doubt that's what you want.

Very interesting problem. I've got to spend my lunch thinking about this.

Posted by Kyph on 2003-07-14 06:37:02