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Emirps
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Emirps are prime numbers which in a given base are also prime (but not the same prime) when the digits are reversed. For example, in base 10, 107 is an emirp since 701 is also prime. Palindromic primes are not emirps (e.g., 101 backwards is 101, the same prime).
See A006567 for more base 10 emirps. Binary emirps are listed in A080790.
