path: root/072.txt

solved with wolframalpha.com:
  sum phi(n), n=2 to 1000000

   3039650753
+  9118948164
+ 15198149566
+ 21277458826
+ 27356832366
+ 33435937046
+ 39515212818
+ 45594757684
+ 51673635564
+ 57752969604
-------------
 303963552391