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Search: id:A074873
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| A074873 |
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Friendly numbers (see A074902) such that sigma(n) is not friendly. |
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+0
1
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| 66, 210, 282, 364, 510, 642, 930, 966, 1080, 1092, 1146, 1624, 2130, 2226, 2346, 2586, 2676, 3560, 3810, 4278, 4872, 7965
(list; graph; listen)
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OFFSET
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0,1
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COMMENT
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I do not know how rigorously these numbers have been established. It is possible there are missing terms - see A074902. - njas, Sep 15, 2002
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EXAMPLE
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6 is friendly, but so is sigma(6)=12, so 6 is not in the sequence. 210 is friendly (with 17360 for example), but sigma(210)=576 is not friendly.
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CROSSREFS
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Adjacent sequences: A074870 A074871 A074872 this_sequence A074874 A074875 A074876
Sequence in context: A043514 A044398 A044779 this_sequence A046393 A117306 A120102
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KEYWORD
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nonn
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AUTHOR
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Jon Perry (perry(AT)globalnet.co.uk), Sep 12 2002
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