The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A218407 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A218407

Numbers k for which sigma(k)/k - 2/5 is an integer.
(history; published version)

#24 by Michael De Vlieger at Sat May 13 20:00:44 EDT 2023

STATUS

reviewed

approved

#23 by Andrew Howroyd at Sat May 13 17:59:14 EDT 2023

STATUS

proposed

reviewed

#22 by Jon E. Schoenfield at Sat May 13 17:15:46 EDT 2023

STATUS

editing

proposed

#21 by Jon E. Schoenfield at Sat May 13 17:15:31 EDT 2023

NAME

Numbers n k for which sigma(nk)/n = k+ - 2/5 with is an integer k.

FORMULA

sigma(n)/n = k+2/5 with integer k.

STATUS

approved

editing

#20 by Harvey P. Dale at Sun Dec 25 14:59:56 EST 2022

STATUS

editing

approved

#19 by Harvey P. Dale at Sun Dec 25 14:59:53 EST 2022

COMMENTS

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

STATUS

approved

editing

#18 by T. D. Noe at Wed Jun 26 11:22:08 EDT 2013

STATUS

editing

approved

#17 by T. D. Noe at Wed Jun 26 11:22:05 EDT 2013

COMMENTS

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

STATUS

approved

editing

#16 by Joerg Arndt at Wed Jun 26 11:00:00 EDT 2013

STATUS

proposed

approved

#15 by Joerg Arndt at Wed Jun 26 05:07:02 EDT 2013

STATUS

editing

proposed