A218412 Numbers k for which sigma(k)/k - 5/7 is an integer.

14, 588, 2520, 11466, 167580, 10999296, 67858560, 132723360, 8644446720, 31002402816, 65367751680, 10941315840000, 13980221805312, 24365070213120, 225855341712000, 317483934427296, 901703887257600, 1550629681348608, 8494794723340800

Offset: 1

Author

Zdenek Cervenka, Oct 28 2012

Keywords

• nonn

Comments

a(12) > 10^11. - Donovan Johnson, Oct 31 2012

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

Crossrefs

Cf. A218428, A218409, A218410, A218411, A218413.

Extensions

a(6)-a(11) from Donovan Johnson, Oct 31 2012

More terms from Michel Marcus, Jun 25 2013