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Comments in green were written by me. Comments in blue were not written by me.
Small nitpick on problem 1 fun fact. I think you meant 509202. 509203 is already prime so the price would be 509203. The way you set up the problem (2a_n+1) only gets to (k*2^n-1) if you start with k-1, so your k needs to be one smaller than the Wikipedia's k.
Dan
on /blog/90
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@Dan: Well spotted, I've edited the post
Matthew
on /blog/90
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