|
%I #11 Jul 11 2015 00:28:00
%S 9,21,42,82,130,330,450,666,1050,1470,1950,2922,4074,5586,7770,11154,
%T 15810,22638,30702,42570,53130,68970,107690,159390,206910,289830,
%U 395190,610350,823290,1185570,1522290,2168250,3011850,4103490,5364450
%N Smallest number m such that when A051953 is applied n times to m the result is neither a power of 2 nor 0.
%C An analog for A000005 is A049117.
%F Applying cototient-function A051953 n+1 times to a(n), a power of 2 or 0 appears; a(n) is the smallest with this property.
%e a(6)=330 and the iteration of A051953 applied to 330 gives sequence {330,250,150,110,70,46,24,16,8,4,2,1,0}. Six iterations result in the 6th term 24 which still is neither a power of 2 nor 0. For smaller numbers than 330 these 6 iterations yield a power of 2 or the fixed number 0.
%Y Cf. A051953, see also its iterates.
%K nonn
%O 1,1
%A _Labos Elemer_, Jan 14 2000
%E More terms from _Jud McCranie_, Jan 14 2000
|
