|
| |
|
|
A218411
|
|
Numbers n for which sigma(n)/n = k+4/7 with integer k.
|
|
5
|
|
|
|
280, 18620, 411264, 804384, 871416, 1222144, 1284192, 164989440, 270138960, 318729600, 326781000, 396168192, 481572000, 623397600, 675347400, 995248800, 3444711424, 4426793280, 307030348800, 465036042240, 880719036120
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
1,1
|
|
|
COMMENTS
|
a(19) > 10^11. - Donovan Johnson, Oct 31 2012
a(22) > 10^12. - Giovanni Resta, Nov 04 2012
|
|
|
LINKS
|
Table of n, a(n) for n=1..21.
|
|
|
FORMULA
|
sigma(n)/n = k+4/7 with integer k
|
|
|
CROSSREFS
|
Cf. A218428, A218409, A218410, A218412, A218413.
Sequence in context: A357248 A094895 A223107 * A272715 A282439 A255498
Adjacent sequences: A218408 A218409 A218410 * A218412 A218413 A218414
|
|
|
KEYWORD
|
nonn
|
|
|
AUTHOR
|
Zdenek Cervenka, Oct 28 2012
|
|
|
EXTENSIONS
|
a(8)-a(18) from Donovan Johnson, Oct 31 2012
a(19)-a(21) from Giovanni Resta, Nov 04 2012
|
|
|
STATUS
|
approved
|
| |
|
|
