%I #9 Jul 10 2015 19:59:07
%S 8,50,162,470,9584,28400,91890,193040,265070,291824,337100,388830,
%T 524070,3231824,18052070,30949850,31021880,65552768,774659600,
%U 10276607888,38128783428,190067750300,4835458627140,25515567812750
%N Analog of A060410 for the 7x+1 problem (cf. A133421).
%C The 7x+1 map sends x to x/2 if x is even, x/3 if x is divisible by 3, x/5 if x is divisible by 5, otherwise 7x+1.
%H N. J. A. Sloane, <a href="/A133426/b133426.txt">Table of n, a(n) for n=1..53</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">The px+1 problem</a>
%H <a href="/index/3#3x1">Index entries for sequences related to 3x+1 (or Collatz) problem</a>
%Y Cf. A133421, A133425, A133419, ...
%K nonn
%O 1,1
%A _N. J. A. Sloane_, Nov 27 2007