%I #6 Mar 30 2012 16:50:06
%S 1001,3004,1502,751,2254,1127,3382,1691,5074,2537,7612,3806,1903,5710,
%T 2855,8566,4283,12850,6425,19276,9638,4819,14458,7229,21688,10844,
%U 5422,2711,8134,4067,12202,6101,18304,9152,4576,2288,1144,572,286,143,430,215,646
%N Trajectory of 1001 under "3x+1" map.
%D V. Klee and S. Wagon, Unsolved Problems, Math. Assoc. America, 1991, p. 191.
%H T. D. Noe, <a href="/A100709/b100709.txt">Table of n, a(n) for n=0..142</a>
%Y Cf. A006370.
%K nonn
%O 0,1
%A _N. J. A. Sloane_, Apr 10 2006