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 A109666 #10 Aug 09 2025 07:43:30 %S A109666 1,2,5,10,15,20,25,30,40,50,60,75,100,120,125,128,150,175,200,225,250, %T A109666 256,300,350,375,384,400,450,500,512,525,600,625,640,675,700,750,768, %U A109666 800,875,896,900,1000,1024,1050,1125,1152,1200,1250,1280,1350,1375,1400 %N A109666 Numbers k such that A002034(k) = A109631(k). %H A109666 Jinyuan Wang, <a href="/A109666/b109666.txt">Table of n, a(n) for n = 1..10000</a> %Y A109666 Cf. A002034, A109631. %K A109666 nonn,base %O A109666 1,2 %A A109666 _Jason Earls_, Aug 06 2005