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A023198
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Numbers k such that sigma(k) >= 4*k.
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7
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27720, 30240, 32760, 50400, 55440, 60480, 65520, 75600, 83160, 85680, 90720, 95760, 98280, 100800, 105840, 110880, 115920, 120120, 120960, 128520, 131040, 138600, 141120, 143640, 151200, 163800, 166320, 171360, 176400, 180180, 181440, 184800
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OFFSET
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1,1
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COMMENTS
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Called 4-abundant numbers. The first odd number is A119240(4) = 1853070540093840001956842537745897243375. - T. D. Noe, Mar 31 2011
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REFERENCES
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Melvyn B. Nathanson, Elementary Methods in Number Theory, Springer, 2000, p 260.
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LINKS
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MATHEMATICA
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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