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%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
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