1 -- For decades the car that won the "national" championship the previous season typically wore this number the next season. It's also been a successful number at the Speedway, as the winner has carried this number to Victory Lane seven times (3rd most all-time) and has sat on the pole a record 13 times. Unfortunately that tradition seemed to go away as drivers and teams were identified more and more with specific car numbers but setting aside the No. 1 would be a nod to the heritage of open wheel racing.
14 -- A.J. Foyt...'nuff said. Next to the late Dale Earnhardt's No. 3, this might be one of the most famous driver/number combinations in motorsports history. While his team should be able to use 14 (which is currently being carried by Vitor Meira) for as long as it likes, it should never be run by another organization.
I'm not saying the series should start finding reasons to retire numbers left and right, unless they want to become like the Boston Celtics. But there are a handful of numbers that are special to the sport, and specifically the 500, and those should be recognized in a special way.