Longest Modern Era Sweet 16 Streaks and their seeding each year:
North Carolina (1985-1993) - 2, 3, 1, 2, 2, 8, 1, 4, 1 (Two Final Fours)
Duke (1998-2006) - 1, 1, 1, 1, 1, 3, 1, 1, 1 (Three Final Fours)
Gonzaga (2015-Present) - 2, 11, 1, 4, 1, 1, 1, 3 (Two Final Fours)