Egyptians and Babylonians must have had some ideas about primes but what are the earliest mentions or comments? Where is the first list of primes?
After Burkert's work on Pythagoreanism an answer about 'unidentified pythagoreans' would not count much. Euclide's proof (about the infinity of primes IX.20) is a landmark in mathematics well known enough to make later writings historically unintersting.
More specifically did early Greek philosophers mention primes and are there possibly different words and/or confusions?