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 A283511 #13 Dec 22 2024 20:15:07 %S A283511 2,5,8,22,23,25,156,157,158,159,306,356,357,358,359,360,503,690,1432, %T A283511 1433,1434,1435,1436,1437,1438,3014,4507,6280,7726,7727,7728,7729, %U A283511 7730,7731,7732,7733,7734,7735,16857,16858,16859,30365,30366,30367,30368,30369,30370,30371,30372,30373,30374,30375 %N A283511 Length of shortest prefix of the Kolakoski sequence K (A000002) containing all blocks of length n that appear in K. %e A283511 The Kolakoski sequence contains 10 distinct blocks of length 4; the last to appear is 2121, which appears for the first time beginning at position 19 of K (indexing starting at position 1), so a prefix of length 22 contains all 10 length-4 subwords. %Y A283511 Cf. A000002, A007782, A283512. %K A283511 nonn %O A283511 1,1 %A A283511 _Jeffrey Shallit_, Mar 09 2017