79
This number is a prime.
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| Kari Phillips ©2003 |
79 is a generalized Sophie-Germain prime. That's to say
that 79 and 4*79+1 is also prime! Not only that but the
emirp of 79 is also prime for (p, 4p+1)! Funnily enough, if
we multiply and add 79's digits: 7*9+7+9, we also get 79 as
well! [Anitha]
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