Search: id:A074242
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%I A074242
%S A074242 5602,42346,184650339,356930335
%N A074242 Numbers n such that sigma(n+1) = reverse(sigma(n)).
%C A074242 These are all the terms < 10^7.
%e A074242 sigma(5602 + 1) = 6048 = reverse(8406) = reverse(sigma(5602)), so 5602 
               is a term of the sequence.
%t A074242 Do[ If[FromDigits[Reverse[IntegerDigits[DivisorSigma[1, n]]]] == DivisorSigma[1, 
               n + 1], Print[n]], {n, 1, 10^7}]
%Y A074242 Sequence in context: A109565 A126784 A071813 this_sequence A032737 A058003 
               A014799
%Y A074242 Adjacent sequences: A074239 A074240 A074241 this_sequence A074243 A074244 
               A074245
%K A074242 base,more,nonn,bref
%O A074242 1,1
%A A074242 Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Sep 19 2002
%E A074242 a(3)-a(4) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Feb 01 
               2009

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