Dictionary

emirp en · NOUN

Pronunciation

• /ˈiːˌmɝp/

Etymology

prime spelled backwards.

Meanings

1. A prime number that becomes a different prime when its decimal digits (or digits in some specified other base) are reversed.
   • The first few emirps in base 12 (using the convention T for ten and E for eleven) are: 15, 51, 57, 5E, 75, E5, 107, ...
   • The sequence of emirps begins: 13, 17, 31, 37, 71, 73, 79, 97, 107, ...
   • Therefore we do not yet know whether the general emirps go on forever or whether they too eventually end with a largest emirp of all. 1986, Malcolm E. Lines, A Number for your Thoughts, Taylor & Francis, page 39:

Forms