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 A023700 #12 Sep 13 2023 07:31:04 %S A023700 8,17,20,23,24,25,35,44,47,50,51,52,56,59,60,61,65,68,69,70,72,73,75, %T A023700 76,89,98,101,104,105,106,116,125,128,131,132,133,137,140,141,142,146, %U A023700 149,150,151,153,154,156,157,164,167,168 %N A023700 Numbers with exactly 2 2's in their ternary expansion. %H A023700 Seiichi Manyama, <a href="/A023700/b023700.txt">Table of n, a(n) for n = 1..10000</a> %t A023700 Select[ Range[ 189 ], (Count[ IntegerDigits[ #, 3 ], 2 ]==2)& ] %K A023700 nonn,base,easy %O A023700 1,1 %A A023700 _Olivier Gérard_