What is this pill-'blue and round-13'-imprint?

Pill imprint I3 has been identified as Naproxen sodium 220 mg.

Naproxen is used in the treatment of pain; back pain; headache; osteoarthritis; sciatica (and more), and belongs to the drug class nonsteroidal anti-inflammatory agents. Risk cannot be ruled out during pregnancy.
You can view an image here https://www.drugs.com/imprints/i-3-17393.html