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 18:02:58; Last Modified: 2018-12-26 02:58:10.
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