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Topic: Divisible by...
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Posts: 1
Registered: 12/3/04
Divisible by...
Posted: Nov 10, 1995 11:51 AM
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My name is Joseph and I have a question I hope someone can
help me with.

Does anyone know if there is a rule/trick to knowing when an
integer is divisible by 7 or 13. Is there a good source for
these rules which would include a proof or explanation ?
Are there more divisibility rules I can glean? I've tried
some books on number theory but can't find a complete list.

I have the rules for 2, 3, 5, 8, and 11. (are there more?)

Any help will be greatly appreciated.

Joseph J. Kostal

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