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Search: id:A083211
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| A083211 |
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Abundant numbers (A005101) with no subset of their divisors such that the complement has the same sum. |
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+0
4
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| 18, 36, 72, 100, 144, 162, 196, 200, 288, 324, 392, 400, 450, 576, 648, 738, 748, 774, 784, 800
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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A083206(a(n))=0; subsequence of A083210.
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LINKS
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Eric Weisstein's World of Mathematics, Abundant Number.
Reinhard Zumkeller, Illustration of initial terms
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EXAMPLE
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Divisors of n=18: {1,2,3,6,9,18}; 18 is pseudo-perfect (A005835):
18=9+6+3, but there exist no two complementary subsets of divisors having
the same sum, therefore 18 is a term.
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CROSSREFS
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Sequence in context: A097926 A087967 A070224 this_sequence A023149 A115550 A061713
Adjacent sequences: A083208 A083209 A083210 this_sequence A083212 A083213 A083214
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KEYWORD
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nonn
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AUTHOR
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Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Apr 22 2003
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