where's the code? care to pastebin it?

anyway, unless I have a morning brainf*ck that should be 20908774861

=)

this might help

well, that's the formula but I guess you cannot use that if it's an assignment

actually you can. since you just add by 1, you can substitute the a1 as 205 and a(n-205) as 204493...

I meant an assignment as in "class assignment" - like: "do this exactly, no shortcuts"

well, it's a shortcut, but you can argue that it's a more optimal solution-- unless your assignment is about loops.. =\

no, not assigment of course =)

1 step soln:

sum(205: 1: 204493)