1111111111111111111

This number is a prime.

                                                        111111111 1111111111

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The largest prime factor of the alternate-digit, palindromic semiprime 1010101010101010101010101010101010101 is the repunit prime 1111111111111111111. Both numbers contain 19 1's. [Green]

Submitted: 2009-12-19 20:22:32;   Last Modified: 2009-12-19 21:17:14.
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