摘要：
If you are a fan of Harry Potter, you would know the world of magic has its own currency system — as Hagrid explained it to Harry, “Seventeen silver S 阅读全文
摘要：
People in Mars represent the colors in their computers in a similar way as the Earth people. That is, a color is represented by a 6-digit number, wher 阅读全文
摘要：
A number that will be the same when it is written forwards or backwards is known as a Palindromic Number. For example, 1234321 is a palindromic number 阅读全文