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Test for divisibility by 13
( go to the article → https://www.johndcook.com/blog/2020/11/10/test-for-divisibility-by-13/ )
There are simple rules for telling whether a number is divisible by 2, 3, 4, 5, and 6. A number is divisible by 2 if its last digit is divisible by 2. A number is divisible by 3 if the sum of its digits is divisible by 3. A number is divisible by 4 if […] The post Test for divisibility by 13 first appeared on John D. Cook.
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