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Search: id:A133814
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| A133814 |
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Smallest primitive abundant number or perfect number with 2^n as a factor. |
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+0
1
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| 945, 6, 20, 88, 272, 1184, 4288, 16768, 65792, 266752
(list; graph; listen)
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OFFSET
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0,1
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EXAMPLE
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945=3^3*5*7 least primitive abundant number with no factor 2, a(0)=945
6=2*3 perfect number, a(1)=6
20=2^2*5 primitive abundant number < 28=2^2*7 perfect number, a(2)=20
88=2^3*11
272=2^4*17
1184=2^5*37
4288=2^6*67
16768=2^7*131
65792=2^8*257
266752=2^9*521
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CROSSREFS
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Sequence in context: A052238 A104302 A106431 this_sequence A104438 A125013 A005231
Adjacent sequences: A133811 A133812 A133813 this_sequence A133815 A133816 A133817
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KEYWORD
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nonn
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AUTHOR
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Pierre CAMI (pierrecami(AT)tele2.fr), Jan 06 2008
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