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 A375998 #5 Sep 05 2024 08:07:30 %S A375998 15,80,4010,12031,255312,2686719,117178358,436210878,91532745555 %N A375998 The smallest positive number that when written in all bases 2 to n contains four or more adjacent equal digits. %e A375998 a(7) = 2686719 as 2686719 = 1010001111111011111111_2 = 12001111111010_3 = 22033323333_4 = 1141433334_5 = 133330303_6 = 31560000_7, each of which contains four or more adjacent equal digits. %Y A375998 Cf. A375958, A375997, A171901, A055085, A368866. %K A375998 nonn,more %O A375998 2,1 %A A375998 _Scott R. Shannon_, Sep 05 2024