Posted by Anonymous on Thursday, October 17, 2013 at 4:33pm.
input 1 2 3 4 5 6 7
output5 9 13 17

math  Steve, Thursday, October 17, 2013 at 5:55pm
judging from what I see, we have the output increasing by 4 when the input increases by 1.
so, look for something like
y = 4x
Since 5=4+1, I'd try
y = 4x+1
That seems to work.
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