22222...22299 (19153-digits)

This number is a probable-prime (likely to be a prime but we have not (re-)proven it on this site).

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The largest minimal 4k+3 prime, i.e., a prime of the form 4k+3 such that deleting any number of its digits never gives another prime of the form 4k+3. [Rupinski]

Submitted: 2006-05-23 12:55:13;   Last Modified: 2008-01-30 11:28:00.
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