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A218413 Numbers k for which sigma(k)/k - 6/7 is an integer. 5
168, 11172, 217854, 228480, 446880, 220093440, 5228496000, 10805558400, 14091504577920, 583455456460800, 2583890834482298880, 5510058011880428160, 224050000769667072000, 1022756201136515973120, 1314073124731389718080, 2661277331943365990400 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
a(9) > 10^11. - Donovan Johnson, Oct 31 2012
a(9) > 10^12. - Giovanni Resta, Nov 04 2012
Note that there are no terms with abundancy 13/7. - Michel Marcus, Jun 25 2013
LINKS
Table of n, a(n) for n=1..16.
CROSSREFS
Cf. A218428, A218409, A218410, A218411, A218412.
Sequence in context: A006363 A271033 A019286 * A064767 A115222 A290152
Adjacent sequences: A218410 A218411 A218412 * A218414 A218415 A218416
KEYWORD
nonn
AUTHOR
Zdenek Cervenka, Oct 28 2012
EXTENSIONS
a(6)-a(8) from Donovan Johnson, Oct 31 2012
More terms from Michel Marcus, Jun 25 2013
STATUS
approved

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Last modified June 1 12:42 EDT 2024. Contains 373023 sequences. (Running on oeis4.)