A218416 Numbers k for which sigma(k)/k - 5/9 is an integer.

117, 3780, 66960, 167400, 406224, 1097280, 6656832, 13035330, 29410290, 4529295360, 27477725184, 88071903612, 1159632322560, 7035102756864, 18554223329280, 22385029489560, 54934276752360, 112562288197632, 125356165141536, 307631949813216, 1317932346931200

Offset: 1

Author

Zdenek Cervenka, Oct 28 2012

Keywords

• nonn

Comments

a(13) > 10^11. - Donovan Johnson, Nov 01 2012

a(13) > 10^12. - Giovanni Resta, Nov 04 2012

Note that there are no terms here with abundancy 23/9 (k=2). - Michel Marcus, Jun 25 2013

Crossrefs

Cf. A218414, A218430, A160320, A218415, A160321, A218417, A218418.

Extensions

a(10)-a(12) from Donovan Johnson, Nov 01 2012

More terms from Michel Marcus, Jun 25 2013