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| Primes galore (Posted on 2025-05-11) |
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19 is a prime number with an interesting property. If you put a 1, 3, 7, or 9 at the end, then you will get 4 more primes. 191, 193, 197, and 199 are all prime. What is the next number p>19 such that p, p1, p3, p7, p9 are all prime?
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Submitted by Math Man
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