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 A121537 If n appears then 2n, 3n and 4n do not. 0
 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, 53, 54, 55, 56, 59, 61, 63, 64, 65, 66, 67, 71, 72, 73, 77, 78, 79, 81, 83, 85, 88, 89, 91, 95, 97, 99, 101, 102, 103, 104, 107, 109, 113, 114, 115, 117, 119, 121, 125, 127, 131 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS A003159 If n appears then 2n does not. A036668 If n appears then 2n and 3n do not. LINKS MATHEMATICA s={1}; Do[If[FreeQ[s, n/2]&&FreeQ[s, n/3]&&FreeQ[s, n/4], AppendTo[s, n]], {n, 2, 150}]; s CROSSREFS Cf. A003159, A036668. Sequence in context: A138469 A089362 A333532 * A285219 A047577 A293481 Adjacent sequences:  A121534 A121535 A121536 * A121538 A121539 A121540 KEYWORD nonn AUTHOR Zak Seidov, Aug 06 2006 STATUS approved

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Last modified August 4 11:58 EDT 2021. Contains 346447 sequences. (Running on oeis4.)