From the link:

> approximately one in every 6200 2688-digit numbers is prime.

So if you're lucky, you only need to brute force the last 4 digits! Maybe 5 if you're unlucky. In either case, that's a lot less work than I imagined. And of course you can skip all the even numbers.

Kinda more 'primes from images' (w/a tiny area that can't be used) than 'images from primes'. Still cool though!

How did you get 4 digits? Wouldn't that mean 1 in every 2^4 = 16 is prime? For 1 in every 6200 shouldn't it be 12 digits?

I think the confusion here is that the first image is generated by rendering a prime in binary. The rest appear to be decimal, though, which leads to the result of 4 digits.

Bits != digits

You can skip all multiples of 3 also.

You skip all multiples of anything, but evens are easy to check.