せりかログ

こじつけっぽいとこもあるような気もするけど，数の不思議ということで．

3 x 37 = 111 -> 1 + 1 + 1 = 3
6 x 37 = 222 -> 2 + 2 + 2 = 6
9 x 37 = 333 -> 3 + 3 + 3 = 9

1 x 1 = 1
11 x 11 = 121
111 x 111 = 12321

1 x 9 + 2 = 11
12 x 9 + 3 = 111
123 x 9 + 4 = 1111

9 x 9 + 7 = 88
98 x 9 + 6 = 888
987 x 9 + 5 = 8888

1 x 8 + 1 = 9
12 x 8 + 2 = 98
123 x 8 + 3 = 987

7 x 7 = 49
67 x 67 = 4489
667 x 667 = 444889

4 x 4 = 16
34 x 34 = 1156
334 x 334 = 111556