421
This number is a prime.
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The concatenation of the number of 1-digit primes and the
number of 2-digit primes. [Gaydos]
The 421st prime number (2909) and the 421st Honaker number
(9902) are anagrams. [Gaydos]
(There is one curio for this number that has not yet been approved by an editor.)
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