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1 7 2 5 6 = ( 2 9 0 − 1 ) 1 2 8 = ( 0 1 2 8 ) . 2 9 0 1 2 8 − ( 1 1 2 8 ) . 2 9 0 1 2 7 + ⋯ + ( 1 2 6 1 2 8 ) . 2 9 0 2 − ( 1 2 7 1 2 8 ) . 2 9 0 + 1 = ⋯ + 6 8 3 5 6 4 8 0 0 − 3 7 1 2 0 + 1 = ⋯ + 6 8 3 5 2 7 6 8 1