cp's OEIS Frontend

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.

A243128 Squarefree numbers k such that 4k <= sum of squarefree divisors of 4k.

Table of values

n a(n)
1 3
2 15
3 21
4 33
5 35
6 39
7 51
8 57
9 69
10 87
11 93
12 105
13 111
14 123
15 129
16 141
17 159
18 165
19 177
20 183
21 195
22 201
23 213
24 219
25 231
26 237
27 249
28 255
29 267
30 273
31 285
32 291
33 303
34 309
35 321
36 327
37 339
38 345
39 357
40 381
41 385
42 393
43 399
44 411
45 417
46 429
47 435
48 447
49 453

List of values

[3, 15, 21, 33, 35, 39, 51, 57, 69, 87, 93, 105, 111, 123, 129, 141, 159, 165, 177, 183, 195, 201, 213, 219, 231, 237, 249, 255, 267, 273, 285, 291, 303, 309, 321, 327, 339, 345, 357, 381, 385, 393, 399, 411, 417, 429, 435, 447, 453]