A loopeing script with a variable used for the repetition number can do this, but why? Repeating fields are usually not the best option for you data in today's FileMaker. Usually, another structure--such as a table of related records works better.
Here's the script, but keep in mind that it's working with a data structure that probably is not the best option for your database:
Set Variable [$K ; value: $K + 1]
Exit Loop If [$K > /* put max number of repetitions here */ ]
Set Field [YourTable::RepeatingField [$K] ; Get ( CurrentDate ) + $K - 1 ]