Prime Factors Grid 23 x 23

Sieve of Eratosthenes

This is a 23 x 23 grid with 1 at the top left and 529 at bottom right.

Prime numbers are given a black square; other numbers are given grey according to how many prime factors they have.

For example a number with four prime factors is given a white square,
like 230 = 2 x 3 x 5 x 7

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Coded with - processing.org/

109/814

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