Tax day is approaching. That means lots of us are crunching numbers – which is usually a pretty fun thing to do. Sometimes the numbers can evolve in unexpected but very satisfying patterns. Here is one example.

1 x 1 = 1

11 x 11 = 121

111 x 111 = 12321

1111 x 1111 = 1234321

11111 x 11111 = 123454321

111111 x 111111 = 12345654321

1111111 x 1111111 = 1234567654321

11111111 x 11111111 = 123456787654321

111111111 x 111111111 = 12345678987654321

One may be the loneliest number but not for long if you multiply.