

A218407


Numbers k for which sigma(k)/k  2/5 is an integer.


5



30, 140, 2480, 6200, 40640, 297600, 997920, 64995840, 167751680, 1502582400, 42949345280, 183196016640, 687193456640, 1447428787200, 63870637017600, 326676430080000, 20797363851264000, 24871926476966400, 42981218625945600, 404918548479244800
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OFFSET

1,1


COMMENTS

Note that there are no terms here with abundancy 7/5 (k=1).  Michel Marcus, Jun 26 2013


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CROSSREFS



KEYWORD

nonn


AUTHOR



EXTENSIONS



STATUS

approved



