Single Digit Representations of Natural Numbers From 15001 to 20000

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 bring numbers 15001 to 20000 in terms of each digit. The total worEk up to 20000 numbers divided in four parts. For other parts refer reference list.