383

This number is a prime.

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The largest prime in the binary sequence 101, 1011, 10111..., 101111111. The only one which is not prime is, ironically, the 7 digit 1011111 with 5 consecutive ones. [Homewood]

Submitted: 2018-04-19 13:02:58;   Last Modified: 2018-12-25 20:58:10.
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