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A comment on Divisibility by 7 is a Walk on a Graph (2009). Parent comment

Re:Divisibility by 7 is a Walk on a Graph (2009) by anewhnaccount on Monday November 09, 2015 @02:57AM (#10531826)
This is a DFA over the alphabet {0, 1} where the number is first transformed by writing out each digit in unary with 1 and delimiting digits with 0.
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