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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]

The smallest palindromic prime in the form 'prime-d-emirp'. '13-d-31' is a palindromic prime for d = 3, 8, and 9. Curiously, 389 is also an emirp. [Green]