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Search: id:A101937
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| A101937 |
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Numbers n with omega(n) > omega of 2 nearest larger and 2 nearest smaller neighbors. |
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+0
2
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| 6, 30, 42, 60, 66, 70, 78, 84, 90, 102, 105, 110, 114, 120, 126, 150, 165, 174, 186, 190, 195, 198, 204, 210, 234, 246, 252, 255, 270, 273, 276, 290, 294, 300, 315, 318, 322, 330, 336, 345, 354, 357, 360, 385, 390, 396, 399, 402, 414, 420
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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150 is in the sequence because it has three unique prime factors (2,3,and 5), whereas 148, 149, 151, and 152 each have fewer.
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MATHEMATICA
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For[i=2, i<1000, If[And[Length[FactorInteger[i-2]]<Length[FactorInteger[i]], Length[FactorInteger[i-1]]<Length[FactorInteger[i]], Length[FactorInteger[i+1]]<Length[FactorInteger[i]], Length[FactorInteger[i+2]]<Length[FactorInteger[i]]], Print[i]]; i++ ]
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CROSSREFS
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Cf. A001221, A101933.
Sequence in context: A130512 A127662 A003062 this_sequence A101939 A114649 A090126
Adjacent sequences: A101934 A101935 A101936 this_sequence A101938 A101939 A101940
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KEYWORD
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easy,nonn
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AUTHOR
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N. Fernandez (primeness(AT)borve.org), Dec 21 2004
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