A218410 - OEIS

%I #22 May 15 2023 12:14:34

%S 840,55860,1089270,3666432,5322240,8714160,10281600,20109600,21785400,

%T 32104800,9904204800,10334134272,4660073935104,7322605472000,

%U 11887123248000,15387946358400,78599399424000,516876560449536,750304684523520,812193794048000

%N Numbers k for which sigma(k)/k - 3/7 is an integer.

%C a(13) > 10^11. - _Donovan Johnson_, Oct 31 2012

%C a(13) > 10^12. - _Giovanni Resta_, Nov 04 2012

%C Note that there are no terms with abundancy 10/7 or 17/7. - _Michel Marcus_, Jun 25 2013

%Y Cf. A218428, A218409, A218411, A218412, A218413.

%K nonn

%O 1,1

%A _Zdenek Cervenka_, Oct 28 2012

%E a(5)-a(12) from _Donovan Johnson_, Oct 31 2012

%E More terms from _Michel Marcus_, Jun 25 2013