Single Digit Representations of Natural Numbers From 5001 to 10000

There are different ways of representing natural numbers, such as, writing in terms of 1 to 9 or 9 to 1, writing in terms of single letter, single digit, flexible power, etc. These types of representations we call as crazy representations. This paper extends the authors previous work on representation of natural numbers in terms of single digit. This paper bring numbers 5001 to 10000 in terms of each digit. The total work up to 20000 numbers divided in four parts.