An emirp is an integer that, when its digits are written in reverse order, is a prime number. For example, 73 is an emirp because 37 is prime. What is the smallest two-digit prime number that is NOT an emirp?
37 and 73 are also part of a smaller sequence. The list contains prime numbers in which every single permutation (including deletion) is prime
There are only these 6 numbers in the list.
Answer to your question (if the second number isn't double-digit): 10
Answer to your question (if the second number is double-digit): 12