Prime Scan

Your browser checks a block of numbers nobody has looked at.

Primes thin out as they get bigger and they seem to do it very evenly, no bunching, no gaps where a pile should be. Nobody knows why, and nobody can prove it stays true forever. So we look: your browser takes a stretch nobody has checked, finds the primes in it, and sees whether they sit as evenly as they should. If they ever don't, that is worth a very long look.