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https://liveyourmaths.com/2016/11/26/%cf%84%ce%bf-%ce%bc%ce%b9%ce%ba%cf%81%cf%8c-%ce%b8%ce%b5%cf%8e%cf%81%ce%b7%ce%bc%ce%b1-%cf%84%ce%bf%cf%85-fermat/
Το μικρό θεώρημα του Fermat