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A081000
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n is a member if and only if it ranks among top n positive integers in centrality (cf. A080997 for fuller description of this concept).
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4
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1, 2, 3, 4, 6, 8, 10, 12, 14, 15, 16, 18, 20, 21, 24, 27, 28, 30, 32, 36, 40, 42, 44, 45, 48, 50, 52, 54, 56, 60, 63, 64, 66, 68, 70, 72, 75, 76, 78, 80, 84, 88, 90, 96, 98, 99, 100, 102, 104, 105, 108, 110, 112, 114, 117, 120
(list; graph; refs; listen; history; internal format)
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