This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A274133 #6 Jun 26 2016 10:45:31 %S A274133 2,9,14,15,20,27,32,37,42,47,52,57,62,129,134,139,144,149,154,159,164, %T A274133 169,174,179,184,189,194,195,199,200,204,205,209,210,214,215,219,220, %U A274133 224,225,229,230,234,235,239,240,244,245,249,250,254,255,260,265,270,275 %N A274133 Numbers representable as ror(x)+rol(x) in two or more ways, where ror(x)=A038572(x) is x rotated one binary place to the right, rol(x)=A006257(x) is x rotated one binary place to the left. %C A274133 These are the duplicates in A273105. %e A274133 ror(5) + rol(5) = 6 + 3 = 9, and also ror(16) + rol(16) = 8 + 1 = 9, therefore 9 is in the sequence. %Y A274133 Cf. A006257, A038572, A273105. %K A274133 nonn,base %O A274133 1,1 %A A274133 _Alex Ratushnyak_, Jun 10 2016