In 2013-2014, author (click here) wrote natural numbers in increasing and decreasing orders of 1 to 9 using only basic operations. See below some examples:


For more details and extension work by other see the following link:

The above study include the natural numbers till 30000. In some case factorials and or square-roots are used.
Recently, author wrote the above numbers till 100000 in increasing and decreasing orders of 1 to 9 and 9 to 1 using only the idea of factorials along with basic operations. Below are few examples

These numbers are written in four parts. See the links below:

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