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Emirps
Basic Info
Discovered by N/A
Number of Unknown
Description A prime which is a different prime to itself if read backwards
First Few 13, 17, 31, 37, 71, 73, 79, 97, 107, 113

Emirps, which is Prime spelled backwards, are prime numbers that are "reversible". When their digits are reversed, they can form a different prime number.

This excludes Palindromic Primes, since the result has to be different than the original number.

Examples

  • 13 is the first emirp. When reversed, it becomes 31, which is also a prime number.
  • 17 is the second emirp. When reversed, it becomes 71, which is also a prime number.
  • Since 13 is an emirp, 31 is also an emirp, since the digits becomes 13 when reversed.

The First Few Emirps

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