Prime Curios!: 1000000009

1000000009
(another Prime Pages' Curiosity)

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The smallest ten-digit prime with sum of digits equal to the number of digits. [Necula]

1000000007 and 1000000009 are the largest known pair of twin primes of the form [10^n + 7, 10^n + 9].

The smallest emirp of the form 10^n + n (n=9). [Loungrides]

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