you literally have to put in every number for it to do mathematics correctly...
its as stupid as that. some try to get around it by indeed only having the 10 different digits and glue them together, but its a hallucination that that works.
an important point in generalization is for example that you teach it something. This is literally important
'ycombinator is a website' is a prompt that is almost impossible of ycombinator is not in your training set