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 A381892 #6 Mar 19 2025 10:38:26 %S A381892 99,260515,18997153,37362253,50601157,122925461,534483448 %N A381892 Numbers k such that A381781(k) is negative. %e A381892 A381781(99) = -810. %Y A381892 Cf. A381781, A381893. %K A381892 nonn,hard,more %O A381892 1,1 %A A381892 _Simcha Z. Katzoff_, Mar 09 2025