CSU Math Club
In Spring 2015 we will meet every Thursday from 11:30 AM12:15 PM in RT 1516.
Sign up on Google Groups below to receive a weekly email with the topic or activity of the week. Divisibility Rules
Sean Sheridan Thursday, April 2, 2015
11:30 AM  12:15 PM, RT 1516 While factoring large integers tends to be a hard problem in general, there are various methods for mentally determining whether a number is divisible by various small integers. For example, an integer is divisible by three if and only if the sum of its digits is divisible by three. We will state various divisibility rules like this one, show how they apply to various integers, and provide proofs for them. Pizza and beverages will be provided Everyone is welcome!
