Emirp

A Mirpzahl ( MIRP = prime spelled backwards ) is a prime number that can be read backwards yields another prime number. ( A Primzahlpalindrom is therefore no Mirpzahl since read backwards while also yields a prime number, but no other, but the same. ) In contrast to the prime property Mirpzahl property also depends on the value system employed.

The first Mirpzahlen in the decimal system are 13, 17, 31, 37, 71, 73, 79, 97, 107, 113 ( sequence A006567 in OEIS ).

The largest known Mirpzahl is.

However, the Mirpzahlen comes to no particular mathematical meaning. They can be rather associated with the field of recreational mathematics.