The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A263572 Numbers n that minimize sigma(n) / (n^(1-delta) d(n)) for some delta > 0, where d = divisor count = A000005, sigma = divisor sum = A000203. 2
 1, 2, 6, 12, 60, 120, 360, 2520, 5040, 55440, 720720, 1441440, 4324320, 21621600, 367567200, 6983776800, 13967553600, 321253732800, 2248776129600, 65214507758400, 195643523275200, 6064949221531200, 12129898443062400, 448806242393308800, 18401055938125660800 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS These are the miserable average divisor numbers. Similar to superior highly composite numbers (A002201) or colossally abundant numbers (A004490). a(2)..a(26) are also the first 25 terms of A002201. LINKS William C. Jagy, Table of n, a(n) for n = 1..93 Math Stack Exchange, Bounds on the average of the divisors of natural numbers CROSSREFS Cf. A000005, A000203, A002201, A004490. Sequence in context: A265125 A328549 A002201 * A004490 A224078 A309811 Adjacent sequences:  A263569 A263570 A263571 * A263573 A263574 A263575 KEYWORD nonn AUTHOR William C. Jagy, Oct 21 2015 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified January 22 00:08 EST 2022. Contains 350481 sequences. (Running on oeis4.)