%I #3 Oct 21 2012 11:25:41
%S 0,9,10,17,28,38
%N Strength records in 3x+1 problem.
%H Eric Roosendaal, <a href="http://www.ericr.nl/wondrous/strengths.html">3x + 1 strength records</a>
%Y Cf. A217935, A217936, A217937.
%K nonn,more
%O 1,2
%A _N. J. A. Sloane_, Oct 21 2012