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Art of Problem Solving
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and language arts learners in grades 2-12.
denote the set of positive divisors of 
Let ![\[S_i = \{d \mid d \in S, \, d \equiv i \pmod4\}\]](http://latex.artofproblemsolving.com/8/c/d/8cd108edc94e14f4f933e8e2b67920b2c608254c.png)
and let 
denote the sum of all elements of 
Find the value of ![\[s_0^2+s_1^2+s_2^2+s_3^2-2s_0s_2-2s_1s_3.\]](http://latex.artofproblemsolving.com/5/7/3/573a18475c4a2169e8689b1c7de50d4603a4eb70.png)
Art of Problem Solving is an
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