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A098223
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Integer quotients when sigma[sigma[x]]/x is integer.
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3
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1, 2, 2, 3, 4, 2, 3, 7, 6, 8, 2, 6, 6, 9, 8, 6, 10, 10, 3, 8, 4, 6, 7, 8, 2, 9, 10, 8, 4, 10, 10, 7, 13, 8, 8, 8, 2, 6, 8, 14, 2, 9, 7, 8, 6, 9, 8, 13, 8, 15, 14, 6, 9, 9, 8, 10, 12, 14, 13, 8, 8, 11, 6, 14, 16, 12, 14, 12, 16, 15, 12, 18, 16, 11, 8, 22
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OFFSET
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1,2
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COMMENTS
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Below n=5x10^11, q=5 and 17 quotients do not appear; smallest numbers providing integer quotients = 1, 2, 3, 4,..., 16,... are as follows: 1, 2, 8, 15, _?_, 42, 24, 60, 168, 480, 57669920, 2200380, 57120, 217278, 1058148, 7526400,... - updated by Jud McCranie, Feb 08 2012
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LINKS
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Jud McCranie, Table of n, a(n) for n = 1..130
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FORMULA
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In order of appearance the sigma[sigma[A019278(n)]]/A19278(n) quotients which are by definition integer numbers.
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CROSSREFS
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Cf. A098219-A098222, A019278, A008333, A051027.
Sequence in context: A117632 A127731 A159978 * A114892 A194331 A143595
Adjacent sequences: A098220 A098221 A098222 * A098224 A098225 A098226
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Oct 25 2004
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STATUS
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approved
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