Search: id:A053569
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%I A053569
%S A053569 3,6,13,18,12,31,18,20,32,36,24,31,42,40,30,48,54,48,38,42,44,78,72,48,
%T A053569 57,93,72,98,54,72,90,60,62,127,84,144,68,96,144,72,74,124,140,96,80,
%U A053569 121,126,84,108,132,120,180,90,168,144,120,98,156,217,102,104,192,162
%N A053569 Sum of divisors of numbers which cannot be sum of divisors of any number.
%C A053569 See also comments to A053474
%F A053569 a(n)=A000203[A007369[n]]
%e A053569 The 13th non-sigma number is 26.Its divisors are: {26,13,2,1} of which 
               the sum is 42.So a(13)=42. Also a(20)=42, the divisor sum of 20th 
               term in A007369, which is 41.
%Y A053569 A000203, A007369, A053474.
%Y A053569 Sequence in context: A009788 A102966 A145604 this_sequence A115283 A078382 
               A075651
%Y A053569 Adjacent sequences: A053566 A053567 A053568 this_sequence A053570 A053571 
               A053572
%K A053569 nonn
%O A053569 1,1
%A A053569 Labos E. (labos(AT)ana.sote.hu), Jan 17 2000

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