Arduino project

https://www.circuito.io/app?components=512,11061
https://www.arduino.cc/en/Tutorial/Circuit
http://www.circuitbasics.com/how-to-set-up-an-lcd-display-on-an-arduino/

https://www.tinkercad.com/things/fXk7ZPLEZo2-dazzling-jaagub/editel

Magoosh 1000

https://pastebin.ubuntu.com/p/W92gzfhH3t/

Important sites

https://ieeexplore.ieee.org/document/6547630

https://stackoverflow.com/questions/269268/how-to-implement-big-int-in-c

https://codeforwin.org/2017/09/recursion-c-programming.html