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13331 (another Prime Pages' Curiosity) |
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will be down at times on those day (and possibly the next). (caldwell@utm.edu) Inserting any digit d between adjacent digits of this palindromic prime never produces a new prime. [De Geest] The minimum palindromic prime p such that p + 1 each has exactly 4 distinct prime factors. [Das] The smallest palindromic prime with 5 embedded primes: 3331, 331, 31, 13 and 3. [Necula]
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