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1. The problem statement, all variables and given/known data

I need to be able to understand and likely prove that for any positive odd integer n,

8 | (n^2 -1 )

2. Relevant equations

3. The attempt at a solution

odd can be said to be n = 2k +1

so 8 | (2k + 1)^2 -1

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# Prime Division HELP

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