1989530586646177

This number is a prime.

                                                           198953 0586646177

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The smallest prime which remains prime if any of these 13 numbers is placed in front of the digits: {1, 3, 4, 6, 7, 9, 10, 13, 15, 16, 18, 21, 22}. These are the smallest numbers which can be placed in front of the same prime without giving divisibility by 3 or 7. [Andersen]