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21 (another Prime Pages' Curiosity) |
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Single Curio View: (Seek other curios for this number) The number of known positive integers which cannot be written as p * q + r, where p, q, r are three distinct primes. [Capelle]
Submitted: 2006-11-15 04:51:05; Last Modified: 2008-01-30 11:28:00.
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