1, 3, 673, 2019 4 factors is almost a prime.
Let's denote only 4 factor numbers like 2019, i.e. every factor is a unique integer that occurs only once, as "almost a prime" number. A problem is to compute efficiently all "almost a prime" numbers between 1 and any given prime number. Almost certainly a waste of time unless some pattern might be discovered that allows one to predict and compute primes faster than other methods. I have no idea where to begin because I am not a mathematician and because I am very new to J. HAPPY 2019! ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
