Question 1207597
<pre>
It's interesting that the greatest prime divisor of the sum happened to turn out
to be the same as the number of terms, 135-5+1=131.  

It's further interesting that the greatest prime term of the series is also 131. 
[Note that 133 is not prime since 133=7x19].

[Some more workout for the brain. lol]

Edwin</pre>