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Search: id:A100367
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| A100367 |
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Even numbers of which number of distinct prime-factors equals 2. |
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+0
2
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| 6, 10, 12, 14, 18, 20, 22, 24, 26, 28, 34, 36, 38, 40, 44, 46, 48, 50, 52, 54, 56, 58, 62, 68, 72, 74, 76, 80, 82, 86, 88, 92, 94, 96, 98, 100, 104, 106, 108, 112, 116, 118, 122, 124, 134, 136, 142, 144, 146, 148, 152, 158, 160, 162, 164, 166, 172, 176, 178, 184, 188
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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This is a proper subset of A098202. E.g. 210 is not here, but it is there.
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FORMULA
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Numbers of the form 2^k*p^h where k>0, h>=0 p is an od prime.
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MATHEMATICA
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lf[x_] :=Length[FactorInteger[x]]; ta={{0}}; Do[If[Equal[lf[n], 2]&&EvenQ[n], ta=Append[ta, n]; Print[n]], {n, 1, 256}]; ta=Delete[ta, 1]
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CROSSREFS
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Cf. A001221, A098902, A100368.
Adjacent sequences: A100364 A100365 A100366 this_sequence A100368 A100369 A100370
Sequence in context: A060702 A054741 A098902 this_sequence A114989 A129493 A036350
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Nov 22 2004
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