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).

Just showing those entries submitted by 'Rupinski': (Click here to show all)

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]