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I think Nebraska's list is three. 

Boston College
Virginia
Vanderbilt

Good topic.  MSU's list is longer than I would have guessed, but partly probably due to not being a major program until the 50s.  We were playing Hillsdale and Michigan Normal regularly until then

Arkansas
Clemson
Duke
Oklahoma
Oklahoma State
Ole Miss
South Carolina
Tennessee
Texas
Utah
Vanderbilt
Virginia
Virginia Tech
Wake Forest

Not even sure where to find such a list.  Off the top of my head I know that Texas has never played Clemson or Florida State.  I'd love to get one or both scheduled.

Until the 2005 Rose Bowl, Texas had never played Michigan or Ohio State.  Now we've played both, at least in bowl games, and also have upcoming home-and-home series with both, which is going to be awesome.

Not even sure where to find such a list. 

I just pulled up MSU's media guide

What P5 programs have never squared off against your school on the gridiron?

For OSU, it is Iowa St, Kansas, Ole Miss, Mississippi St, Georgia Tech and Wake Forest.

Iowa St and Kansas stand out as odd, being in the Midwest. Georgia Tech and Ole Miss would probably be the most intriguing match ups in that group.

Here is how I would rank Ohio State's list in order from the game I would most like to see to the game I would least like to see:
 - 1)  Georgia Tech:  I think this would be a nice OOC series because GaTech is good enough that it could be challenging.  Also, Atlanta is a fun destination and not too far of a drive (for those who like to drive) and an easy flight due to ATL being a big hub (for those who like to fly).  
 - 2)  Ole Miss:  Basically just because they are an SEC team.  
 - 3)  Mississippi State:  See #2 above.  
 - 4)  Wake Forest:  Recruiting is better in NC than KS so I'd rather play the Deacons than the Jayhawks
 - 5)  Kansas:  I wouldn't schedule a H&H with Kansas unless we got at least a six game HHH&HHH basketball series out of the deal and even then I wouldn't be thrilled about it.  
 - 6)  Iowa State:  Anything that is good for the Cyclones is bad for the Hawkeyes and that is bad for the B1G so I wouldn't schedule ISU under any circumstances.  

Here is how I would rank Ohio State's list in order from the game I would most like to see to the game I would least like to see:
 - 1)  Georgia Tech:  I think this would be a nice OOC series because GaTech is good enough that it could be challenging.  Also, Atlanta is a fun destination and not too far of a drive (for those who like to drive) and an easy flight due to ATL being a big hub (for those who like to fly). 
 - 2)  Ole Miss:  Basically just because they are an SEC team. 
 - 3)  Mississippi State:  See #2 above. 
 - 4)  Wake Forest:  Recruiting is better in NC than KS so I'd rather play the Deacons than the Jayhawks
 - 5)  Kansas:  I wouldn't schedule a H&H with Kansas unless we got at least a six game HHH&HHH basketball series out of the deal and even then I wouldn't be thrilled about it. 
 - 6)  Iowa State:  Anything that is good for the Cyclones is bad for the Hawkeyes and that is bad for the B1G so I wouldn't schedule ISU under any circumstances. 

You wouldn’t schedule ISU under any circumstances because of Iowa?  Really?

Yes, they are an instate competitor to a fellow B1G team so I wouldn't schedule them. 

That seems kind of silly.  I don’t mean that to sound spirited but it’s the word that fits best for me.  I don’t think a home and home against ISU does anything substantial to Iowa’s program one way or another. I’m guessing the same standard applies to Pitt and, really, ND.