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Numbers k for which sigma(k)/k - 3/4 is an integer.
2

%I #21 May 13 2023 17:39:19

%S 4,47616,293760,1782144,3485664,134209536,282977280,746444160,

%T 1459956960,1684126080,1716728832,27298252800,41233360896,

%U 376591138560,719045268480,1622308746240,38965526046720,41769966551040,985261739212800,3067660098994176

%N Numbers k for which sigma(k)/k - 3/4 is an integer.

%C a(14) > 10^11. - _Donovan Johnson_, Oct 31 2012

%C a(16) > 10^12. - _Giovanni Resta_, Nov 04 2012

%Y Cf. A218404, A159907.

%K nonn

%O 1,1

%A _Zdenek Cervenka_, Oct 28 2012

%E a(6)-a(13) from _Donovan Johnson_, Oct 31 2012

%E a(14)-a(15) from _Giovanni Resta_, Nov 04 2012

%E More terms from _Michel Marcus_, Jun 26 2013