Uploaded April 2026 | Updated September 2026, 2 weeks ago

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Find 10 composite numbers in a row? Easy.
100? Still doable.
A million? Yep.

This proof, explained by Dr Trefor Bazett, shows how.

If you like the idea of wrestling with ideas of infinity, and learning about more of Dr Trefor's favourite mathematical proofs, take a look at his online course with Oxford Lifelong Learning ⬇️
lifelong-learning.ox.ac.uk/courses/the-art-of-proofs-masterclass-with-dr-trefor?code=O25P759MAZ%3Futm_source%3Dfb&utm_medium=organic&utm_campaign=2604-dr-trefor&fbclid=IwY2xjawREazZleHRuA2FlbQIxMABicmlkETFUT1VTSXliZGdPcGFxTHlkc3J0YwZhcHBfaWQQMjIyMDM5MTc4ODIwMDg5MgABHlDKdOsEftlAMrhE55-noz_mLLrDdMfyXdPSiw4c-peiFm5_QF1CTdn5ykiN_aem_lzvsvm8dKsVuKoJTB2AIAQ