Add 4 each time
It's every other odd number.
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The rule for the pattern is y=x+2. That rule is in the table format in which it would originally be in, but the worded rule would be 'It increases by 2 each time'.
consecutive square numbers
+5
Add 4 to the previous number
The 13 should be 31... then 1+1+1=3 1+1+3=5 1+3+5=9...