This number is a composite.

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The smallest base-2 pseudoprime that is a hexadecimal repunit: R4 = 0x1111. The second is R7, and by concatenating them, one has the third, R11. [Yosei]

Submitted: 2019-07-15 05:29:25;   Last Modified: 2019-07-15 06:48:48.
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