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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
OFFSET
1,2
COMMENTS
A003159 If n appears then 2n does not. A036668 If n appears then 2n and 3n do not.
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
Sequence in context: A138469 A089362 A333532 * A285219 A047577 A293481
KEYWORD
nonn
AUTHOR
Zak Seidov, Aug 06 2006
STATUS
approved