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 A122442 #9 Apr 20 2024 10:27:17
%S A122442 2,5,3,11,7,39,287,231,191,127,359,511,239,159,639,283,991,251,167,
%T A122442 111,1695,1307,871,927,671,155,103,1639,91,3431,3399,2287,71,6395,47,
%U A122442 31,2047,27,1819,17691,6887,4591,13439,6383,4255,7963,7527,12399,7279,1583
%N A122442 Least k such that the Collatz (3x+1) iteration starting with k has "dropping time" A122437(n).
%H A122442 T. D. Noe, <a href="/A122442/b122442.txt">Table of n, a(n) for n = 1..130</a>
%t A122442 With[{s = 1 + Log2[3]}, {2}~Join~Table[(k = 3; While[-1 + Length@ NestWhileList[If[EvenQ[#], #/2, 3 # + 1] &, k, # >= k &] != m, k += 2]; k), {m, Array[Floor[1 + s*#] &, 50]}] ] (* _Michael De Vlieger_, Apr 19 2024 *)
%Y A122442 Cf. A122437 (allowable "dropping times" of the Collatz iteration).
%K A122442 nonn
%O A122442 1,1
%A A122442 _T. D. Noe_, Sep 06 2006