exam Maths Puzzle Numerical Ability

what is the defining rule for 5, 11, 29, 83, 245

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I hope this is posted in the correct place. I need some help I do not understand how to do this. Thanks for any help you can give.
solve by elimination process and type an ordered pair.
4x - 9y = 14.5
7y - 2x = -8.5 If two opposite sides of a square are increased by 9 meters and the other sides are decreased by 6 meters, the area of the rectangle that is formed is 78 square meters. Find the area of the original square.