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# 11111111111111111111117

This number is a prime.

111 1111111111 1111111117

This near-repunit prime can be written as R23+6, where R stands for the *n*th repunit. It and R23 are in fact the largest known cases of a single group of ten numbers from (1)w0 to (1)w9 containing more than one prime.

The smallest near-repunit prime containing *p* times
the smallest repunit prime *p*. [Beedassy]

11111111111111111111111 is a unique happy prime, but unfortunately, 11111111111111111111117 is its unhappy sexy neighbor! [Green]

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