A palprime is a palindromic prime number, a prime number that when reversed (read right to left instead of left to right) is the same prime number. 11, 101, 373, and 929 are palprimes.

An emirp is a prime number that is the reverse of a different prime number. The word 'emirp' is the reverse of the word 'prime'. Emirps occur in pairs: 107 and 701, 347 and 743, 769 and 967.

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