If you want a chord with just the thirteenth than just say "added 13".
For example, a C(added 13) would contain the notes: C E G A. Tipically when you want to use an added 13 you just call it a C6 (A is the 13 and the 6 in the key of C). All of the other ones, like added 11 or added 2 are all written out as "added (blank)"
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