摘要:
Palindromic Number 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 阅读全文
摘要:
Have Fun with Numbers Notice that the number 123456789 is a 9-digit number consisting exactly the numbers from 1 to 9, with no duplication. Double it 阅读全文