A218413 Numbers k for which sigma(k)/k - 6/7 is an integer.

168, 11172, 217854, 228480, 446880, 220093440, 5228496000, 10805558400, 14091504577920, 583455456460800, 2583890834482298880, 5510058011880428160, 224050000769667072000, 1022756201136515973120, 1314073124731389718080, 2661277331943365990400

Offset: 1

Author

Zdenek Cervenka, Oct 28 2012

Keywords

• nonn

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

Crossrefs

Cf. A218428, A218409, A218410, A218411, A218412.

Extensions

a(6)-a(8) from Donovan Johnson, Oct 31 2012

More terms from Michel Marcus, Jun 25 2013