Originally Posted by HiddenX The number 142857 The number 142857 multiplied with 1, 2, 3, 4, 5, 6 results in products, that have all the same six digits in another order: 1 x 142857 = 142857 3 x 142857 = 428571 2 x 142857 = 285714 6 x 142857 = 857142 4 x 142857 = 571428 5 x 142857 = 714285 Rows & columns of the products match, too. HiddenX, who loves mathematics!