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 A381598 #7 Mar 01 2025 22:48:39 %S A381598 1,9,34,147,111,359,437,389,594,826,1102,83317,1789,5142,2931,12671 %N A381598 Index of first term of three consecutive n's in A381597. %C A381598 The terms vary greatly in size - after 5.2 million terms of A381597 no three consecutive 17's or 18's have appeared, although three consecutive 19's appear at index 6474. The largest known term is a(192) = 5135798. %Y A381598 Cf. A381597, A381599, A370708, A281511, A229037. %K A381598 nonn,more %O A381598 1,2 %A A381598 _Scott R. Shannon_, Mar 01 2025