7

This number is a prime.

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The number of ways that primes can be written as the sum of one or more distinct natural numbers less than or equal to 4. That is to say {2}, {3}, {1+2}, {1+4}, {2+3}, {3+4}, {1+2+4}. [Deutsch]

Submitted: 2013-04-16 14:45:28;   Last Modified: 2019-02-02 10:45:33.
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