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A039725
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Even abundant numbers divided by 2.
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3
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6, 9, 10, 12, 15, 18, 20, 21, 24, 27, 28, 30, 33, 35, 36, 39, 40, 42, 44, 45, 48, 50, 51, 52, 54, 56, 57, 60, 63, 66, 69, 70, 72, 75, 78, 80, 81, 84, 87, 88, 90, 93, 96, 98, 99, 100, 102, 104, 105, 108, 110, 111, 112, 114, 117, 120, 123, 126, 129, 130, 132, 135, 136
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| While the first even abundant number is 12 = 2^2*3, the first odd abundant is 945 = 3^3*5*7, the 232th abundant number!
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LINKS
| T. D. Noe, Table of n, a(n) for n = 1..10000
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FORMULA
| a(n) = A173490(n) / 2.
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EXAMPLE
| The first even abundant number is 12, so 12/2 = 6 is the first element in this sequence.
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CROSSREFS
| Cf. A005101, A005231, A173490.
Sequence in context: A177201 A090466 A090428 * A125494 A177029 A105066
Adjacent sequences: A039722 A039723 A039724 * A039726 A039727 A039728
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KEYWORD
| easy,nonn
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AUTHOR
| James A. Sellers (sellersj(AT)math.psu.edu)
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EXTENSIONS
| Corrected and edited by Daniel Forgues (kephalopod(AT)gmail.com), Nov 22 2010
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