Search: id:A053229
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%I A053229
%S A053229 1,3,5,7,9,11,13,15,17,19,21,23,25,27,29,31,33,35,37,39,41,43,45,47,49,
%T A053229 51,53,55,57,59,61,63,65,67,69,71,73,75,77,79,81,83,85,87,89,91,93,95,
%U A053229 97,99,101,103,104,105,107,109,111,113,115,117,119,121,123,125,127,129
%N A053229 Numbers n for which second differences of sigma(n) are negative.
%p A053229 with(numtheory): seq(`if`(sigma(i+2)-sigma(i+1)<(sigma(i+1)-sigma(i)),
               i,print( )),i=1..133);
%Y A053229 Cf. A000203, A053223, A053228.
%Y A053229 Sequence in context: A064679 A081874 A165747 this_sequence A157142 A004273 
               A005408
%Y A053229 Adjacent sequences: A053226 A053227 A053228 this_sequence A053230 A053231 
               A053232
%K A053229 nonn
%O A053229 1,2
%A A053229 Asher Auel (asher.auel(AT)reed.edu) Dec 10, 2000

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