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Description
which numbers go into n? if n = 20 the answer is {1, 2, 4, 5, 10, 20}. let's draw circles of those sizes in a width of 20. the biggest circle is left out of each picture. can you 'spot' the primes? how about the super-composites? let it run a couple of times.

Description
which numbers go into n? if n = 20 the answer is {1, 2, 4, 5, 10, 20}. let's draw circles of those sizes in a width of 20. the biggest circle is left out of each picture. can you 'spot' the primes? how about the super-composites? let it run a couple of times.