This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A353409 #25 May 09 2022 10:33:04 %S A353409 2047,13421773,14073748835533 %N A353409 Smallest overpseudoprime to base 2 (A141232) with n distinct prime factors. %C A353409 a(5) > 2^64. %C A353409 a(5) <= 1376414970248942474729, %C A353409 a(6) <= 48663264978548104646392577273, %C A353409 a(7) <= 294413417279041274238472403168164964689, %C A353409 a(8) <= 98117433931341406381352476618801951316878459720486433149, %C A353409 a(9) <= 1252977736815195675988249271013258909221812482895905512953752551821. %Y A353409 Cf. A001567, A007011, A141232, A180065, A328665. %K A353409 nonn,bref,more %O A353409 2,1 %A A353409 _Daniel Suteu_, May 07 2022