This number is a prime.

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1000000087 remains prime after appending and inserting the digit X in all possible positions at the same time: X1X0X0X0X0X0X0X0X8X7X. This is valid for X=3 and for X=9, producing the following two primes 313030303030303038373 and 919090909090909098979. [Rivera]

Submitted: 2019-02-13 14:19:08;   Last Modified: 2019-02-13 14:46:26.
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