The exact number of numbers written down by Shakuntala is not known. However, according to legend, Shakuntala wrote down an infinite number of numbers. This is because she created a mathematical system—one of the earliest forms of arithmetic—that allowed her to write down numbers beyond what had previously been possible.
The story of Shakuntala is an ancient Sanskrit story, based on the Mahabharata, and is one of the most influential stories in the history of mathematics. It tells the story of a young girl, Shakuntala, who is gifted with the ability to write down an infinite number of numbers. She used this skill in order to make calculations and predictions based on astronomical events.
Shakuntala's system of arithmetic formed the basis of the "Pāṇini-Backus Formalism" (BFS); later known as the "Backus–Naur Form" (BNF). BNF is now an electronic language used by computers to interpret data and commands. Thus, Shakuntala's legacy lies in the field of computer science and technology today. Even though we don't know the exact number of numbers she wrote down, her work has had an enormous impact on mathematics and computing.
If you are interested to learn more, I would recommend reading the story of Shakuntala. You can find it here:
https://en.wikipedia.org/wiki/Shakuntala_(mythology)
Additionally, if you are interested to learn more about BNF and how it works, you could check out this page:
https://en.wikipedia.org/wiki/Backus%E2%80%93Naur_form