Subtract 5 times the last digit from remaining truncated number. Repeat the step as necessary. If the result is divisible by 17, the original number is also divisible by 17
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There is no easy rule for divisibility by 34.
The special divisibility rule of 17 is "Take the difference of the rest of the digits and the last digit times 5." For instance: 17 1 - 7 * 5 = 1 - 35 = -34 which is divisible by 17.
By tautology. If it did not work, it would not be a divisibility rule!
What is the divisblity rule by 8
Able to Be Divided