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 A360623 #12 Feb 26 2023 20:22:55 %S A360623 168,3499,53992,653060 %N A360623 Largest k such that the decimal representation of 2^k is missing any n-digit string. %C A360623 All terms are conjectural, checked up to 10^6. %H A360623 Hans Havermann, <a href="http://gladhoboexpress.blogspot.com/2023/02/small-string-final-non-appearance.html">Small-string final non-appearance coincidences in base-ten powers of two</a> %e A360623 168 is the largest base-ten power of 2 that is missing any of the 10 length-1 digit-strings (missing '2'). %e A360623 3499 is the largest base-ten power of 2 that is missing any of the 100 length-2 digit-strings (missing '95'). %e A360623 53992 is the largest base-ten power of 2 that is missing any of the 1000 length-3 digit-strings (missing '661'). %e A360623 653060 is the largest base-ten power of 2 that is missing any of the 10000 length-4 digit-strings (missing '6164'). %Y A360623 Cf. A094776, A360656. %K A360623 nonn,base,more %O A360623 1,1 %A A360623 _Hans Havermann_, Feb 14 2023