|
Search: id:A160321
|
|
|
| A160321 |
|
Numbers n for which sigma(n)/n=k+2/3 with integer k |
|
+0
2
|
|
| 84, 270, 1488, 1638, 24384, 35640, 199584, 2142720, 12999168, 100651008, 208565280, 240589440, 470564640, 3899750400, 6039429120, 25769607168, 36639203328, 53798734080
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
COMMENT
|
a(19) > 2*10^11. [From Donovan Johnson (donovan.johnson(AT)yahoo.com), May 26 2009]
|
|
EXAMPLE
|
84 is in the sequence because sigma(84)/84=224/84=2+2/3
270 is in the sequence because sigma(270)/270=720/270=2+2/3
|
|
CROSSREFS
|
Cf. A360320, numbers n for which sigma(n)/n=k+1/3 Cf. A159907, numbers n for which sigma(n)/n=k+1/2
Sequence in context: A112066 A096383 A137210 this_sequence A131072 A083986 A064198
Adjacent sequences: A160318 A160319 A160320 this_sequence A160322 A160323 A160324
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
J.C.Klein (hklein(AT)planet.nl), May 08 2009
|
|
EXTENSIONS
|
a(10)-a(18) from Donovan Johnson (donovan.johnson(AT)yahoo.com), May 26 2009
|
|
|
Search completed in 0.002 seconds
|
