98989...98989 (161-digits)
This number is a probable-prime (likely to be a prime but we have not (re-)proven it on this site).
9 8989898989 8989898989
8989898989 8989898989 8989898989 8989898989 8989898989 8989898989 8989898989
8989898989 8989898989 8989898989 8989898989 8989898989 8989898989 8989898989
The second largest prime number of the form (98*10^n-89)/99. [Heleen]
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