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%I #5 Feb 04 2015 19:51:11
%S 1,40,20,10,5,196,98,49,1912,956,478,239,9322,4661,181780,90890,45445,
%T 1772356,886178,443089,17280472,8640236,4320118,2160059,84242302,
%U 42121151,1642724890,821362445,32033135356
%N Trajectory of 1 under map n->39n+1 if n odd, n->n/2 if n even
%t NestList[If[EvenQ[#],#/2,39#+1]&,1,30] (* _Harvey P. Dale_, Feb 04 2015 *)
%K nonn
%O 0,2
%A _N. J. A. Sloane_.
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