Hi, if i had no other preferences, i'd use program "bc" in an xterm with enormous scroll buffer. Run in some shell window:
xterm -fg black -bg wheat -sl 100000 & and then in the newly emerged xterm shell window bc (My virtual paper is of eco-friendly color. I do not let xterm start bc directly, because then on bc xommand "quit" the paper would vanish.) Have a nice day :) Thomas