Standard Lemma guide

emirp

noun · 1 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

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Pronunciation

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  • /ˈiːˌmɝp/

1

noun

Meaning 1

A prime number that becomes a different prime when its decimal digits (or digits in some specified other base) are reversed.

Definition source: English Wiktionary via Wiktextract

Topics: mathematics, number-theory, sciences

Examples

  • 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, ...

Meaning relationships

Synonyms: none provided

Antonyms: none provided

History

Etymology

prime spelled backwards.