Would be great to have copy paste functionality
Response from developer
Copy will be possible with version 2.0 for iOS 15 😉

This application helps users perform complex mathematical calculations, including factorials, primality tests, and modular arithmetic. It's designed for students and educators interested in number theory and the properties of integers.
2.0
November 6, 2021
- Text display enhancements for iOS 15 and MacOS Monterey (Truncate for big numbers but minimum character size set) - Possibility to copy the result to the clipboard by clicking on the display! - Factorial calculation up to 80!
MoreCopy will be possible with version 2.0 for iOS 15 😉
calcMod-Light can calculate factorials up to 80!, test if large integers are prime, find divisors of integers, and perform modular exponentiation and inverse calculations.
In the free version of calcMod-Light, there is a limit of 10^10 for modulo operations. The ProX version has no such limit.
The 'n!' button in calcMod-Light calculates factorials of integers from 0 to 80. For larger factorials, up to 2000!, the ProX version is required.
The 'change mod' function in calcMod-Light indicates when a modulo is prime, aiding in primality testing of large integers.
Yes, calcMod-Light allows you to store one number and recall it whenever you need it during your calculations.
calcMod-Light has an age rating of 4+, making it suitable for a wide range of users.
calcMod-Light is currently supported on iPhone and iPod devices.
The latest version of calcMod-Light, 2.0, was released on November 6, 2021. Updates focus on improving functionality and stability.