Smart John

[adrenalineshots]

Hi there! New girl in these parts.
I looked through the tags and the previous requests and didn't really find what I was looking for, so here goes nothing:
Can someone help me find a long, juicy, story with smart!John (either math problems, or logic, or even strategical solutions where he stands out).

The catch in this request is that I would rather read gen stories. Can someone help me?

Thanks in advance!