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

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

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

Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell