emirp.
A prime number that becomes a different prime when its decimal digits (or digits in some specified other base) are reversed.
Meaning & usage
A prime number that becomes a different prime when its decimal digits (or digits in some specified other base) are reversed.
The sequence of emirps begins: 13, 17, 31, 37, 71, 73, 79, 97, 107, ...
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, ...
Where this word comes from
prime spelled backwards.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.