You will obviously need big integer arithmetics extension.
tupper.sm (204,5 КиБ) скачан 788 раз(а).
tupper.sm (202,26 КиБ) скачан 791 раз(а). (revised)

You will need Big Integer Arithmetics plugin.
You can install it from SMath>Tools>Plugins.

Wikipedia page for information about formula:
https://en.wikipedia.org/wiki/Tupper%27s_self-referential_formula

You can create your own tupper number with this site:
https://tuppers-formula.ovh/