Each cell is a natural number. A bright green number = prime (divisible only by 1 & itself); a dim number = composite, crossed off as a multiple of a smaller number. Primes thin out as you go further.
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Hover a cell = see the number & its divisors · click = factorize · adjust speed & range on the right
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Prime density per block (falls as N grows)actual densityestimate 1∕ln x