scramble prime challenge

[Dave Britten]

(02-18-2020 12:55 AM)Don Shepherd Wrote:  So, only a few scramble primes with 2 or 3 or 4 digits, and none beyond that. I had no idea how many I expected, but I guess I'm not surprised at the lack of scramble primes with more than 3 digits; primes are less elusive than I would have thought.

Yeah, I suppose it makes sense intuitively when you think about it. The more digits in the number, the more permutations, and the more chances that at least one will be composite. I wasn't expecting none over 4, though.