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%I #14 May 13 2023 20:00:19
%S 280,18620,411264,804384,871416,1222144,1284192,164989440,270138960,
%T 318729600,326781000,396168192,481572000,623397600,675347400,
%U 995248800,3444711424,4426793280,307030348800,465036042240,880719036120
%N Numbers k for which sigma(k)/k - 4/7 is an integer.
%C a(19) > 10^11. - _Donovan Johnson_, Oct 31 2012
%C a(22) > 10^12. - _Giovanni Resta_, Nov 04 2012
%Y Cf. A218428, A218409, A218410, A218412, A218413.
%K nonn
%O 1,1
%A _Zdenek Cervenka_, Oct 28 2012
%E a(8)-a(18) from _Donovan Johnson_, Oct 31 2012
%E a(19)-a(21) from _Giovanni Resta_, Nov 04 2012
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