Start with any number greater than one, and write down all its divisors, including 1 and itself. Now take the sum of the digits of these divisors (each individual digit!) Eventually, you get 15, the black hole.
Start with any number greater than one, and write down all its divisors, including 1 and itself. Now take the sum of the digits of these divisors (each individual digit!) Eventually, you get 15, the black hole.
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Start with any number greater than one, and write down all its divisors, including 1 and itself. Now take the sum of the digits of these divisors (each individual digit!) Eventually, you get 15, the black hole.
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Start with any number greater than one, and write down all its divisors, including 1 and itself. Now take the sum of the digits of these divisors (each individual digit!) Eventually, you get 15, the black hole.