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A047727
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Average divisor is an integer (A003601) and the number is refactorable (A033950).
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1
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1, 56, 60, 96, 132, 184, 204, 248, 276, 348, 376, 480, 492, 504, 564, 568, 612, 632, 636, 672, 708, 824, 852, 864, 996, 1016, 1056, 1068, 1208, 1212, 1248, 1284, 1336, 1356, 1520, 1528, 1572, 1592, 1632, 1644, 1656, 1784, 1788, 1824, 1908, 1912, 1980
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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FORMULA
| Both r = Sigma[ 1, x ] / x and a=Sigma[ 1, x ] / Sigma[ 0.x ] are integer.
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EXAMPLE
| x=56, Sigma[ 1,56 ]=120, Sigma[ 0,56 ]=8 and a=56/8=7 or r=120/8=15
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CROSSREFS
| Cf. A007691, A001599, A046985, etc.
Sequence in context: A174460 A045001 A116660 * A069810 A154768 A165159
Adjacent sequences: A047724 A047725 A047726 * A047728 A047729 A047730
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KEYWORD
| nonn
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AUTHOR
| Labos E. (labos(AT)ana.sote.hu)
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