The number 142,857

142,857 . 2 = 285,714

142,857 . 3 = 428,571

142,857 . 4 = 571,428

142,857 . 5 = 714,285

142,857 . 6 = 857,142

You can see symmetries in the products. Notice also that the same digits are used in the product as in the first factor. Furthermore the order of the digits are in the same sequence.

Now look at the product, 142,857 . 7 = 999,999.

And 142,857 . 8 = 1,142,856. If we remove the millions digit and add it to the units digit, the original number is formed.