Search: id:A053476
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%I A053476
%S A053476 9,21,42,82,130,330,450,666,1050,1470,1950,2922,4074,5586,7770,11154,
%T A053476 15810,22638,30702,42570,53130,68970,107690,159390,206910,289830,
%U A053476 395190,610350,823290,1185570,1522290,2168250,3011850,4103490,5364450
%N A053476 Smallest number m such that when A051953 is applied n times to m the 
               result is neither a power of 2 nor 0.
%C A053476 An analogue for A000005 is A049117.
%F A053476 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 A053476 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 A053476 A051953, see also its iterates
%Y A053476 Sequence in context: A036704 A107890 A110209 this_sequence A110680 A163205 
               A154862
%Y A053476 Adjacent sequences: A053473 A053474 A053475 this_sequence A053477 A053478 
               A053479
%K A053476 nonn
%O A053476 1,1
%A A053476 Labos E. (labos(AT)ana.sote.hu), Jan 14 2000
%E A053476 More terms from Jud McCranie (j.mccranie(AT)comcast.net), Jan 14 2000

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