A309875 - cp's OEIS frontend

A309875 Cubefree colossally superabundant numbers: cubefree numbers (A004709) k for which there is a positive exponent epsilon such that sigma(k)/k^{1 + epsilon} >= sigma(j)/j^{1 + epsilon} for all cubefree j > 1, so that k attains the maximum value of sigma(k)/k^{1 + epsilon} over the cubefree numbers.

n	a(n)
1	2
2	6
3	12
4	60
5	180
6	1260
7	13860
8	180180
9	900900
10	15315300
11	290990700
12	6692786100
13	194090796900
14	6016814703900
15	42117702927300
16	1558355008310100
17	63892555340714100
18	2747379879650706300
19	129126854343583196100
20	6843723280209909393300
21	403779673532384654204700

[2, 6, 12, 60, 180, 1260, 13860, 180180, 900900, 15315300, 290990700, 6692786100, 194090796900, 6016814703900, 42117702927300, 1558355008310100, 63892555340714100, 2747379879650706300, 129126854343583196100, 6843723280209909393300, 403779673532384654204700]

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List of values