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 A343405 #20 Oct 01 2024 08:50:40 %S A343405 0,1,5,6,11,12,17,18,23,24,29,36,65,72,101,108,137,144,173,209,210, %T A343405 419,420,629,630,839,840,1049,1050,1259,1260,1469,1470,1679,1680,1889, %U A343405 1890,2099,2100,2309,2939,4200,5670,7140,8609,10079,11340,12810,14280,15749 %N A343405 Numbers k such that A343404(k) = k. %C A343405 If m belongs to this sequence, then the number obtained by removing the leading digit from the expansion of m in primary base also belongs to this sequence. %C A343405 So the terms of the sequence can be mapped on a tree with root 0 (see illustration in Links section). %C A343405 Is this sequence infinite? %H A343405 Rémy Sigrist, <a href="/A343405/b343405.txt">Table of n, a(n) for n = 1..1000</a> %H A343405 Rémy Sigrist, <a href="/A343405/a343405.png">Illustration of the terms < 2*3*5*7*11</a> %H A343405 Rémy Sigrist, <a href="/A343405/a343405.gp.txt">PARI program for A343405</a> %H A343405 <a href="/index/Pri#primorialbase">Index entries for sequences related to primorial base</a> %e A343405 A343404(2099) = 2099, so 2099 belongs to this sequence. %o A343405 (PARI) \\ See Links section. %Y A343405 Cf. A266181, A319599, A343404. %K A343405 nonn,base %O A343405 1,3 %A A343405 _Rémy Sigrist_, Apr 14 2021