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The Codabar check
This article explains how credit card numbers are defined and the check digit serves to verify their accuracy.
Number theory
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articleSums of squares and sums of cubes
An account of methods for finding whether or not a number can be written as the sum of two or more squares or as the sum of two or more cubes. -
articleModulus arithmetic and a solution to differences
Peter Zimmerman, a Year 13 student at Mill Hill County High School in Barnet, London wrote this account of modulus arithmetic.