A263572 - cp's OEIS frontend

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.

n	a(n)
1	1
2	2
3	6
4	12
5	60
6	120
7	360
8	2520
9	5040
10	55440
11	720720
12	1441440
13	4324320
14	21621600
15	367567200
16	6983776800
17	13967553600
18	321253732800
19	2248776129600
20	65214507758400
21	195643523275200
22	6064949221531200
23	12129898443062400
24	448806242393308800
25	18401055938125660800

[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]

cp's OEIS Frontend

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.

Table of values

List of values