- The author claims no academic affiliation.
- The title of the paper sounds a bit unusual, the gap is not a property of a prime, is a property of a couple of primes. Also, there's no need to specify 'exactly', that's number theory.
- In general the language used throughout the paper does not follow that of a mathematics paper.
- No LaTeX, extremely minimal bibliography.
These red flags mean nothing if the result is correct, and I would love it to be correct. I don't have time to check the proof, even if it seems to rely on elementary constructions.