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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
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OFFSET
| 0,1
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EXAMPLE
| 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
| Sequence in context: A104302 A106431 A145493 * A104438 A125013 A005231
Adjacent sequences: A133811 A133812 A133813 * A133815 A133816 A133817
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KEYWORD
| nonn
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AUTHOR
| Pierre CAMI (pierre-cami(AT)bbox.fr), Jan 06 2008
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