Christer Nilsson wrote:

Ilmari Heikkinen wrote:
>> ..., 8740, 4370, 4372, 2186,
>> 2188, 1094, 1096, 548, 274, 276, 138, 140, 70, 72, 36, 18, 20, 10, 12,
>> 14, 28, 56, 58, 116, 118, 236, 238, 476, 952, 1904, 1906, 3812, 3814,
>> 7628, 7630, ...

I can confirm that the four digit subproblem 8740 -> 7630 is solved 
optimally.

Is it possible that the complete problem is solved optimally?

Christer

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