%N In the '3x+1' problem, take the sequence of starting values which set new records for the highest point of the trajectory before reaching 1 (A006884); sequence gives iterate where maximal value is reached in the trajectory with that start.
%H N. J. A. Sloane, <a href="/A060411/b060411.txt">Table of n, a(n) for n = 1..88</a> (from the web page of Tomás Oliveira e Silva)
%H Tomás Oliveira e Silva, <a href="http://sweet.ua.pt/tos/3x+1.html">Tables</a> (gives many more terms)
%H <a href="/index/3#3x1">Index entries for sequences related to 3x+1 (or Collatz) problem</a>
%Y Cf. A006884, A060409, A060410.
%A _N. J. A. Sloane_, Apr 06 2001; b-file added Nov 27 2007