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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A307870 Numbers k with record values of the ratio d(k)/ud(k) between the number of divisors and the number of unitary divisors.

Table of values

n a(n)
1 1
2 4
3 8
4 16
5 32
6 64
7 128
8 256
9 432
10 576
11 864
12 1296
13 1728
14 2592
15 3456
16 5184
17 6912
18 10368
19 15552
20 20736
21 31104
22 41472
23 62208
24 82944
25 93312
26 124416
27 186624
28 248832
29 373248
30 497664
31 746496
32 995328
33 1119744
34 1492992
35 2239488
36 2592000
37 2985984
38 3888000
39 5184000
40 7776000

List of values

[1, 4, 8, 16, 32, 64, 128, 256, 432, 576, 864, 1296, 1728, 2592, 3456, 5184, 6912, 10368, 15552, 20736, 31104, 41472, 62208, 82944, 93312, 124416, 186624, 248832, 373248, 497664, 746496, 995328, 1119744, 1492992, 2239488, 2592000, 2985984, 3888000, 5184000, 7776000]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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