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-solved with wolframalpha.com:
- sum phi(n), n=2 to 1000000
-
- 3039650753
-+ 9118948164
-+ 15198149566
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-+ 27356832366
-+ 33435937046
-+ 39515212818
-+ 45594757684
-+ 51673635564
-+ 57752969604
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- 303963552391
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