What QB number is the most underused number in NFL history 1-19?

?2014-10-13T07:41:47Z

15

M. Diego2014-10-13T03:50:56Z

I would say 17, I couldn't think of a QB wearing it without using google

green_lantern662014-10-12T20:17:40Z

I'd guess 19, though I don't have anything to support it.

?2014-10-12T20:50:01Z

14,19 & 18