%I #4 Oct 21 2012 11:28:59
%S 1,63728127,13371194527,3743559068799,100759293214567,
%T 104899295810901231
%N Numbers achieving 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
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