Few years back, the author worked in single-digit representations of natural numbers. In this case each number is represented in terms of each digit, i.e., from 1 to 9. Later similar kind of work is also done in terms of single letter. This work brings patterns in single-digit representations. The work is for the numbers 1-60 and 298-370. The patterns representations of numbers from 61 to 297 shall given in another work.