Wednesday, December 28

The one-billionth Kaprekar number

When I published the first 11 million Kaprekar numbers on September 1, I asked what the one-billionth Kaprekar number was. Today I fashioned my answer. This was a troublesome compute that included a six-week run calculating nothing: I had used in my program the old Mathematica NthSubset directive but had neglected to first load the Combinatorica package in which it resides. Ouch!

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