KöMaL 2007 B4022
Is there a base of notation of numbers in which the rule for divisibility by 9 is the same as the rule for divisibility by 4 in decimal notation, the rule for divisibility by 4 is the same as the rule for divisibility by 9 in decimal notation, and divisibility by 7 can be decided by simply looking at the last digit?
Official text KöMaL. Quoted with source.
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