|
%I #24 May 13 2023 20:00:44
%S 30,140,2480,6200,40640,297600,997920,64995840,167751680,1502582400,
%T 42949345280,183196016640,687193456640,1447428787200,63870637017600,
%U 326676430080000,20797363851264000,24871926476966400,42981218625945600,404918548479244800
%N Numbers k for which sigma(k)/k - 2/5 is an integer.
%C a(12) > 10^11. - _Donovan Johnson_, Oct 31 2012
%C a(14) > 10^12. - _Giovanni Resta_, Nov 04 2012
%C Note that there are no terms here with abundancy 7/5 (k=1). - _Michel Marcus_, Jun 26 2013
%Y Cf. A218406, A218408, A218427.
%K nonn
%O 1,1
%A _Zdenek Cervenka_, Oct 28 2012
%E a(8)-a(11) from _Donovan Johnson_, Oct 31 2012
%E a(12)-a(13) from _Giovanni Resta_, Nov 04 2012
%E More terms from _Michel Marcus_, Jun 26 2013
|
