cred ca ai librarie bc disponibila in lua. Uite bc-ul in shell:
tex: ~ $ echo 95912101285912112391+55101088101994012311|bc
151013189387906124702
tex: ~ $ echo 9591210128591211224354656789674564325678391^2|bc
91991311730790638549984859641984226694440749371652476503814301826970940359462364348881
edit: te ajuta asta? https://github.com/edubart/lua-bint