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A121537 If n appears then 2n, 3n and 4n do not. 0

%I

%S 1,5,6,7,8,9,11,13,17,19,23,25,29,30,31,35,37,40,41,42,43,45,47,48,49,

%T 53,54,55,56,59,61,63,64,65,66,67,71,72,73,77,78,79,81,83,85,88,89,91,

%U 95,97,99,101,102,103,104,107,109,113,114,115,117,119,121,125,127,131

%N If n appears then 2n, 3n and 4n do not.

%C A003159 If n appears then 2n does not. A036668 If n appears then 2n and 3n do not.

%t s={1};Do[If[FreeQ[s,n/2]&&FreeQ[s,n/3]&&FreeQ[s,n/4],AppendTo[s,n]],{n,2,150}];s

%Y Cf. A003159, A036668.

%K nonn

%O 1,2

%A _Zak Seidov_, Aug 06 2006

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Last modified September 20 00:58 EDT 2021. Contains 347577 sequences. (Running on oeis4.)