Computing Prime Numbers

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Problem It is often useful to compute prime numbers (e.g. Encryption). Compute prime numbers up to 20 by use of nested loops.		SideSectionTitle Taken from http://www.flickr.com/photos/daniello/565304023/ An image or By Students section
Solution You start by using a for loop that will count from 1 to 20.
Code SolutionCode goes here. Please DO NOT put your code in <pre> tags!

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