a site with infinite number of pages
If your favourite search engine lacks a built-in calculator capability,
and you would like them to have it -
just ask them to index calc.shpakovsky.ru website.
It's available both in plaintext HTTP mode for those who
prefer speed over security,
and in secure HTTPS mode for those who
prefer otherwise.
It has pages for every combination of any two numbers and 4 basic mathematic operations, with cross-links for easy search engine discoverability. And yes, before you ask - it indeed has a page for 292091397-275633124.
While yes, of course these pages are generated dynamically on request, they should look static and be search engine-friendly.