Sieve of Eratosthenes

Eratosthenes, ~200 BC

Attributed to the Greek mathematician Eratosthenes around 200 BC, this sieve marks composite numbers by iterating through each prime and eliminating its multiples. The grid shows numbers 2 through 60: the current prime is highlighted in coral, its multiples are crossed out in a gold wave, confirmed primes glow teal, and eliminated composites fade away.