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5531 5506 5425 5304 5135 4910 4621

May be this question is to identify the wrong number in the series...

5531 – 5506:       25           <--   5^2    (Series should have started with a difference of 49 ( 7^2) and hence 5555)    

5506 – 5425:       81           <--   9^2               

5425 – 5304:       121         <--   11^2

5304 – 5135:       169         <--   13^2

5135 – 4910:       225         <--   15^2

4910 – 4621:       289         <--   17^2

So, the wrong number is:  5531

Option:  1

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