emirpとは 意味・読み方・使い方

名詞

emirp (plural emirps)

1. (number theory) 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, ...

   • 1986, Malcolm E. Lines, A Number for your Thoughts, Taylor & Francis, page 39:

     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.

使用する際の注意点

• A palindromic prime is not considered an emirp.
• The term reversible prime is generally synonymous with emirp, but sometimes includes palindromic primes. (See Emirp on Wikipedia.Wikipedia )

Further reading

• Emirp on Wikipedia.Wikipedia
• Permutable prime on Wikipedia.Wikipedia

アナグラム

• imper., Perim, Priem, prime, Prime