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Search: id:A098223
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| A098223 |
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Integer quotients when sigma[sigma[x]]/x is integer. |
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+0
1
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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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COMMENT
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Below n=100000000 q=5,17,19 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,...
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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 this_sequence A114892 A143595 A077769
Adjacent sequences: A098220 A098221 A098222 this_sequence 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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