Prime numbers that are still prime after their digits are reversed, like (13,31)(17,71)(37,73)(79,97)(107,701)(113,311)
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Some of them are: 11 13 17 37 and 79
All the two digit prime numbers that can be reversed are 11, 13 and 31, 17 and 71, 37 and 73, and 79 and 97.
13,31 17,71 37,73 79,97
11 13 17 31 37 71 73 79 97
No, 91 is composite.