Some fun large counterexamples to conjectures: https://math.stackexchange.com/questions/514/conjectures-that-have-been-disproved-with-extremely-large-counterexa

Some fun large counterexamples to conjectures: https://math.stackexchange.com/questions/514/conjectures-that-have-been-disproved-with-extremely-large-counterexamples https://math.stackexchange.com/questions/514/conjectures-tha... So maybe Fermat's Last Theorem etc isn't always obviously true. But I do get your point.