Hmmm... here in Argentina (or, better said, Buenos Aires), as far as I know, there is little numerical superstition, at least in isolation. Mostly related with dates.
Tuesday the 13th is an unlucky day. Why? Well, the 13 for the traditional reasons (the number of people in the Last Supper), and Tuesday because... three explanations (I don't know which one is true, if there is a true one):
The 29th of each month is a potential lucky day if you eat Gnocchi and put money under your plate