I have to admit, that is an interesting question.

I'm not sure it's really a question.

But that is why it is interesting 😉 

I'm going to run with scissors and guess #296#

Good try and very close, but the answer is actually ##296##

Or should it be ###296###  😉

JFK was the 35th President.  And then there is 11/22/63, a reference to **261**