
Posted by markr on 31/7/2009, 4:10 am, in reply to "Re: Chocolates galore"
I also get 66671.
(999999-18)*2/3 + 17
129 is the largest multiple of 3 that can't be covered. The others are:
21, 24, 30, 33, 39, 42, 48, 51, 57, 66, 69, 75, 84, 93, 102, 111


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