hola
-1991 X N = R
-1991 X 1 = -1991
-1991 X 2 = -3982
-1991 X 3 = -5973
-1991 X 4 = -7964
-1991 X 5 = -9955
-1991 X 6 = -11946
-1991 X 7 = -13937
-1991 X 8 = -15928
-1991 X 9 = -17919
-1991 X 10 = -19910
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