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, factorizatio

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=2140324650240744961264423072839333563008614715144755017797754920881418023447140136643345519095804679610992851872470914587687396261921557363047454770520805119056493106687691590019759405693457452230589325976697471681738069364894699871578494975937497937 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.