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 A044232 #14 Sep 03 2025 09:38:12 %S A044232 45,109,173,237,301,360,429,493,557,621,685,749,813,872,941,1005,1069, %T A044232 1133,1197,1261,1325,1384,1453,1517,1581,1645,1709,1773,1837,1896, %U A044232 1965,2029,2093,2157,2221,2285,2349,2408,2477,2541 %N A044232 Numbers k such that string 5,5 occurs in the base 8 representation of k but not of k-1. %H A044232 Paolo Xausa, <a href="/A044232/b044232.txt">Table of n, a(n) for n = 1..10000</a> %t A044232 A044232Q[k_] := StringContainsQ[IntegerString[k, 8], "55"] && StringFreeQ[IntegerString[k - 1, 8], "55"]; %t A044232 Select[Range[5000], A044232Q] (* _Paolo Xausa_, Sep 03 2025 *) %Y A044232 Cf. A007094. %K A044232 nonn,base,changed %O A044232 1,1 %A A044232 _Clark Kimberling_