Thread: for loop

I want to do a loop that iterates the numbers: 1,4,7,10
but when doing this loop, this loop iterates 1,3,3,3,3,3.. and keeps showing 3 in infinity.
Should the loop be done in any other way. Thanks...

Code:

for( int i = 1; i < 11; i=+3 )
{			
	MessageBox::Show(Convert::ToString(i));

}