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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.

A384020 Numbers k > 0 such that sigma(A018804(k)) = k*tau(A018804(k)) where sigma denotes the sum of divisors (A000203) and tau denotes the number of divisors (A000005).

Table of values

n a(n)
1 1
2 2
3 3
4 6
5 7
6 10
7 14
8 19
9 21
10 30
11 31
12 37
13 38
14 39
15 42
16 57
17 62
18 70
19 74
20 78
21 79
22 93
23 97
24 111
25 114
26 133
27 139
28 157
29 158
30 186
31 190
32 194
33 199
34 210
35 211
36 217
37 222
38 229
39 237
40 259
41 266
42 271
43 273
44 278
45 291
46 307
47 310
48 314
49 331
50 337
51 367
52 370
53 379
54 390
55 398
56 399
57 410

List of values

[1, 2, 3, 6, 7, 10, 14, 19, 21, 30, 31, 37, 38, 39, 42, 57, 62, 70, 74, 78, 79, 93, 97, 111, 114, 133, 139, 157, 158, 186, 190, 194, 199, 210, 211, 217, 222, 229, 237, 259, 266, 271, 273, 278, 291, 307, 310, 314, 331, 337, 367, 370, 379, 390, 398, 399, 410]

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

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