|
Search: id:A074873
|
|
|
| A074873 |
|
Friendly numbers (see A074902) such that sigma(n) is not friendly. |
|
+0
1
|
|
| 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)
|
|
|
OFFSET
|
0,1
|
|
|
COMMENT
|
I do not know how rigorously these numbers have been established. It is possible there are missing terms - see A074902. - N. J. A. Sloane (njas(AT)research.att.com), Sep 15, 2002
|
|
EXAMPLE
|
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.
|
|
CROSSREFS
|
Sequence in context: A043514 A044398 A044779 this_sequence A046393 A117306 A158070
Adjacent sequences: A074870 A074871 A074872 this_sequence A074874 A074875 A074876
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Jon Perry (perry(AT)globalnet.co.uk), Sep 12 2002
|
|
|
Search completed in 0.002 seconds
|
