foo.c: In function 'main':
foo.c:15:3: warning: this 'else' clause does not guard... [-Wmisleading-indentation]
   15 |   else
      |   ^~~~
foo.c:17:11: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'else'
   17 |           for(d=3;d<=n;d++)
      |           ^~~

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