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There's a Neil Sloane (OEIS creator/curator) playlist from Numberphile which, unsurprisingly, often feature OEIS sequences.

https://www.youtube.com/playlist?list=PLt5AfwLFPxWJXQqPe_llz...

OEIS is amazing and in the same "spirit" I also love factordb. Another "Web 1.0" look which also exists since immemorial times.

It contains, well, factorization of many numbers.

For example here's RSA-250:

https://factordb.com/index.php?query=21403246502407449612644...

I hope sites like these continue to exists for a very long time.

I'd link to one or two other useful oldschool sites that I do still use but I'm not sure they could handle the /. (well, HN) effect.

OEIS is amazing to say the least. It is such an interest collection of sequences as well as a great collection of editors that are willing to keep it all in order! Certainly worth a mention and a contribution.