A218414 Numbers k for which sigma(k)/k - 1/9 is an integer.

540, 3276, 58032, 950976, 1862190, 17660160, 3925389312, 1005014679552, 16080326885376, 17908023591648, 43947421401888, 92069057203200, 207726054681600, 411471933675264, 12363050673792000, 160893693946908502272, 269783631952374398976, 467406267507560908800

Offset: 1

Author

Zdenek Cervenka, Oct 28 2012

Keywords

• nonn

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

Crossrefs

Cf. A218430, A160320, A218415, A218416, A160321, A218417, A218418.

Extensions

a(6)-a(7) from Donovan Johnson, Nov 01 2012

More terms from Michel Marcus, Jun 25 2013