A218429 Numbers k for which sigma(k)/k - 7/8 is an integer.

8, 760320, 1468800, 4612608, 1414886400, 4935598080, 83655936000, 172888934400, 173172916224000, 225464073246720, 575926998958080, 650264059920384, 73439222840111923200, 88160928190086850560, 450645911113324953600, 600860926790121553920

Offset: 1

Author

Zdenek Cervenka, Oct 28 2012

Keywords

• nonn

Comments

a(8) > 10^11. - Donovan Johnson, Nov 01 2012

a(9) > 10^12. - Giovanni Resta, Nov 04 2012

Note that there are no terms here with abundancy 23/8 (k=2). - Michel Marcus, Jun 26 2013

Crossrefs

Cf. A218404, A159907, A218405.

Extensions

a(5)-a(7) from Donovan Johnson, Nov 01 2012

a(8) from Giovanni Resta, Nov 04 2012

More terms from Michel Marcus, Jun 26 2013