You need to create a regex that will do this. Creating a minimum or maximism is quite simple. Trying to do both becomes difficult. Here is one that will return all 13+ numbers:
oTable.fnFilter("([1-9][3-9]|[2-9][0-9]|[0-9]{3,})", 1, true);
This says: 13-99 (excluding 20, 21, 22, 31, 32, etc.) 20-99 100 +
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