1111111111111111111

This number is a prime.

                                                        111111111 1111111111

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The smallest prime Kaprekar number. E.g., 1111111111111111111^2 = 1234567901234567900987654320987654321 and 123456790123456790 + 0987654320987654321 = 1111111111111111111. [Rivera]

Submitted: 2016-07-01 17:45:06;   Last Modified: 2016-07-01 18:16:59.
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