Search: id:A153452
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%I A153452
%S A153452 1,1,1,1,1,2,1,1,2,3,1,3,1,4,5,1,1,5,1,6,9,5,1,4,5,6,5,10,1,16,1,1,14,
               7,
%T A153452 14,9,1,8,20,10,1,35,1,15,21,9,1,5,14,21,27,21,1,14,28,20,35,10,1,35,1,
%U A153452 11,56,1,48,64,1,28,44,70,1,14,1
%N A153452 a(1)=1, for n>1, if 2*m = n or (m/p)*nextprime(p) = n, where p is a prime 
               factor of m ( m runs from 1 to n-1 ), then a(n) = Sum_{m} a(m).
%e A153452 For n=10; (m=5; 2*5 = 10), (m=6; (6/3)*nextprime(3) = 10), hence a(10) 
               = a(5) + a(6) = 3.
%Y A153452 Sequence in context: A025830 A083796 A037039 this_sequence A090680 A029254 
               A063740
%Y A153452 Adjacent sequences: A153449 A153450 A153451 this_sequence A153453 A153454 
               A153455
%K A153452 easy,nonn
%O A153452 1,6
%A A153452 Naohiro Nomoto (fwqfg726(AT)ybb.ne.jp), Dec 26 2008

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