Search: id:A057637
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%I A057637
%S A057637 1,0,2,3,0,5,4,7,0,0,0,11,9,13,8,0,0,17,0,19,0,0,0,23,0,0,0,12,0,29,25,
%T A057637 31,0,0,0,22,0,37,18,27,0,41,0,43,0,0,0,47,0,0,0,0,0,53,0,39,49,0,0,59,
%U A057637 0,61,32,0,0,0,0,67,0,0,0,71,0,73,0,0,0,45,0,79,0,0,0,83,0,0,0,0,0,89
%N A057637 a(n) is the largest number such that sigma(a(n))=n, where sigma is the 
               sum of divisors function (A000203).
%e A057637 x=11 is the largest x such that sigma(x)=12, so a(12)=11.
%Y A057637 Cf. A000203, A051444, A054973.
%Y A057637 Sequence in context: A066913 A090303 A051444 this_sequence A167485 A140508 
               A063956
%Y A057637 Adjacent sequences: A057634 A057635 A057636 this_sequence A057638 A057639 
               A057640
%K A057637 nonn
%O A057637 1,3
%A A057637 Jud McCranie (j.mccranie(AT)comcast.net), Oct 10 2000

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