This number is a composite.
Single Curio View: (Seek other curios for this number)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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