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 A045161 #20 May 21 2023 11:03:44 %S A045161 0,10,15,20,52,53,54,60,65,70,77,78,79,85,90,95,102,103,104,110,115, %T A045161 120,262,263,264,267,268,269,272,273,274,302,303,304,310,315,320,327, %U A045161 328,329,335,340,345,352,353,354,360,365,370,387 %N A045161 Numbers whose base-5 representation contains exactly one 0 and no 1's. %H A045161 Vincenzo Librandi, <a href="/A045161/b045161.txt">Table of n, a(n) for n = 1..7798</a> %t A045161 Select[Range[0, 400], DigitCount[#, 5, 0]==1 && DigitCount[#, 5, 1]==0 &] (* _Vincenzo Librandi_, Jun 29 2019 *) %Y A045161 Cf. A007091. %K A045161 nonn,base %O A045161 1,2 %A A045161 _Clark Kimberling_ %E A045161 a(1) = 0 inserted by _Georg Fischer_, Jun 28 2019