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 A023702 #15 Oct 10 2024 15:12:25 %S A023702 80,161,188,215,224,233,236,239,240,241,323,404,431,458,467,476,479, %T A023702 482,483,484,512,539,548,557,560,563,564,565,593,620,629,638,641,644, %U A023702 645,646,656,665,668,671,672,673,683,692,695 %N A023702 Numbers with exactly 4 2's in their ternary expansion of n. %H A023702 Seiichi Manyama, <a href="/A023702/b023702.txt">Table of n, a(n) for n = 1..10000</a> %t A023702 Select[ Range[ 729 ], (Count[ IntegerDigits[ #, 3 ], 2 ]==4)& ] %t A023702 Select[Range[700],DigitCount[#,3,2]==4&] (* _Harvey P. Dale_, Oct 10 2024 *) %K A023702 nonn,base,easy %O A023702 1,1 %A A023702 _Olivier Gérard_