11111...11111 (211-digits)

This number is a composite.

                                                                           1
1111111111 1111111111 1111111111 1111111111 1111111111 1111111111 1111111111
1111111111 1111111111 1111111111 1111111111 1111111111 1111111111 1111111111
1111111111 1111111111 1111111111 1111111111 1111111111 1111111111 1111111111

+ The smallest factor of the repunit semiprime (10^211-1)/9 is 692624557324389620662782322677336711138108482588281739734375570506492391931849524636731866879. [Luhn]

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