The book is now available! 1111111111111111111
(just those submitted by Rivera)
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                                                        111111111 1111111111

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

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




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