login

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

A218414
Numbers k for which sigma(k)/k - 1/9 is an integer.
5
540, 3276, 58032, 950976, 1862190, 17660160, 3925389312, 1005014679552, 16080326885376, 17908023591648, 43947421401888, 92069057203200, 207726054681600, 411471933675264, 12363050673792000, 160893693946908502272, 269783631952374398976, 467406267507560908800
OFFSET
1,1
COMMENTS
a(8) > 10^11. - Donovan Johnson, Nov 01 2012
a(8) > 10^12. - Giovanni Resta, Nov 04 2012
Note that there are no terms with abundancy 10/9 (k=1) or 19/9 (k=2). Michel Marcus, Jun 25 2013
KEYWORD
nonn
AUTHOR
Zdenek Cervenka, Oct 28 2012
EXTENSIONS
a(6)-a(7) from Donovan Johnson, Nov 01 2012
More terms from Michel Marcus, Jun 25 2013
STATUS
approved