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This series is on base 7 . When converted to base 1 0 , the sequence goes like this: 2 , 4 , 6 , 1 0 , 1 6 , 2 6 , 4 2 where in from the third term, it is the sum of the two previous terms. :D 9th term would be 1 1 0 , converted to base 7 will give us 2 1 5