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 A375958 #8 Sep 05 2024 08:07:39 %S A375958 3,4,22,31,43,122,506,506,1187,3199,11663,18773,18815,32399,177216, %T A375958 177216,177227,5225284,5225284,14295600,21566225,36572552,107730081, %U A375958 107832239,952416000,2293096006,5587865542,6587515515,30174888567,30174888567,107824082399 %N A375958 The smallest positive number that when written in all bases 2 to n contains two or more adjacent equal digits. %e A375958 a(7) = 122 as 122 = 1111010_2 = 11112_3 = 1322_4 = 442_5 = 322_6 = 233_7, each of which contains two or more adjacent equal digits. %Y A375958 Cf. A375997, A375998, A171901, A055085, A368866. %K A375958 nonn %O A375958 2,1 %A A375958 _Scott R. Shannon_, Sep 03 2024