Search: id:A078898
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%I A078898
%S A078898 1,1,1,2,1,3,1,4,2,5,1,6,1,7,3,8,1,9,1,10,4,11,1,12,2,13,5,14,1,15,1,16,
%T A078898 6,17,3,18,1,19,7,20,1,21,1,22,8,23,1,24,2,25,9,26,1,27,4,28,10,29,1,30,
%U A078898 1,31,11,32,5,33,1,34,12,35,1,36,1,37,13,38,3,39,1,40,14,41,1,42,6,43
%N A078898 Number of times the smallest prime factor of n is the smallest prime 
               factor for numbers <=n; a(1)=1.
%C A078898 For n>1: a(n)=1 iff n is prime;
%C A078898 a(2*n) = n.
%F A078898 Ordinal transform of A020639 (Lpf). - Frank Adams-Watters (FrankTAW(AT)Netscape.net), 
               Aug 28 2006
%Y A078898 Cf. A020639, A078899, A078896.
%Y A078898 Sequence in context: A117172 A029207 A111902 this_sequence A130747 A055440 
               A101279
%Y A078898 Adjacent sequences: A078895 A078896 A078897 this_sequence A078899 A078900 
               A078901
%K A078898 nonn
%O A078898 1,4
%A A078898 Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Dec 12 2002

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