1 + 4/7 + 9/49 + 16/343 + .......... to infinity
I couldn't find mistakes on my answer and I still believe it works. Since given only four terms we can get more then one series that have different sums. I thought my answer was the simpliest. At least it satisfies the initial conditions :)
blackjack
<a href="http://c.casalemedia.com/c?s=51816&f=3&id=0" target="_blank"><img src="http://as.casalemedia.com/s?s=51816&u=http://perplexus.info&f=3&id=0&if=0" width="120" height="600" border="0"></a>
flooble's webmaster puzzle
re(2): Solution
