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+ 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]

+ The sum of the squares of three consecutive odd triangular numbers (45^2 + 55^2 + 91^2). Note the three 3's in the middle. [Silva]



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