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 A052058 #13 Oct 19 2021 10:43:20
%S A052058 16,24,25,26,27,38,39,40,42,43,44,45,46,51,95,96,108,169,191,193,198,
%T A052058 202,205,247,250,316,317,379,386,421,422,423,425,485,486,488,589,592,
%U A052058 642,643,659,731,736,758,759,800,835,839,927,971,972,978
%N A052058 Numbers k such that the largest palindromic substring (without leading zeros) of 2^k is a repdigit of minimum length 2.
%H A052058 Sean A. Irvine, <a href="/A052058/b052058.txt">Table of n, a(n) for n = 1..79</a>
%e A052058 2^44 = 175921860{444}16 and this repdigit 444 is its largest palindromic substring.
%Y A052058 Cf. A052059, A052057.
%K A052058 nonn,base
%O A052058 1,1
%A A052058 _Patrick De Geest_, Jan 15 2000
%E A052058 Offset changed to 1 by _Jon E. Schoenfield_, Oct 17 2019