1 , 3, 6 , 10 , 15 , triangular numbers , 1, 2 , 4, 8 , 20, power of 2, 1, 3, 9 , 27 , 81, power of 3 , 1 , 10 , 100 , 1000, power of 10 , 1 , 3, 5, 7, 9, counting odd numbers .

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