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It's me again - I said that my post in reply to "Generalizing to other bases" erroneously attributed an error, but I just checked again and find I was in fact right after all, the contributor had indeed made a mistake in some of his solutions, so best let my first reply stand. But please do some checking yourselves to settle the matter! (Remembering of course to use an octal calculator which displays to the right of the octal point).

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