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A121537 If n appears then 2n, 3n and 4n do not. +0
1
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; listen)
OFFSET

1,2

COMMENT

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

Cf. A003159, A036668.

Sequence in context: A003667 A138469 A089362 this_sequence A047577 A108401 A125298

Adjacent sequences: A121534 A121535 A121536 this_sequence A121538 A121539 A121540

KEYWORD

nonn

AUTHOR

Zak Seidov (zakseidov(AT)yahoo.com), Aug 06 2006

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.


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