2400
This number is a composite.
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The number of 2400-bit primes with one off bit -- i.e, of
form 22400 - 2k - 1 with k = 1 to
2398 -- is 19, breaking the record (for 168 bits) of 17. [Merickel]
Submitted: 2020-09-30 23:46:11; Last Modified: 2026-06-27 18:43:40.
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