15817
This number is a prime.
The smallest prime formed from the concatenation of integral edges of a right triangle (8, 15, 17). Note that 81517 is also prime. [Loungrides]
The 1846th lucky number (17581) and the 1846th prime number
(15817) are the smallest such pair that are anagrams of
each other. Note that 17581 is also a prime number and
15817 is also a lucky number. [Gaydos]
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