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.

A353702 Composite k such that tau(k') = (tau(k))', where tau(k) is the number of divisors of k (A000005) and k' is the arithmetic derivative of k (A003415).

Table of values

n a(n)
1 12
2 15
3 21
4 26
5 27
6 33
7 38
8 57
9 62
10 69
11 74
12 85
13 88
14 93
15 106
16 108
17 129
18 133
19 134
20 145
21 166
22 177
23 178
24 205
25 213
26 217
27 218
28 226
29 237
30 248
31 249
32 253
33 254
34 262
35 265
36 278
37 309
38 314
39 328
40 362
41 375
42 376
43 393
44 398
45 417
46 422
47 424
48 445
49 459
50 466
51 469
52 488
53 489
54 493
55 502

List of values

[12, 15, 21, 26, 27, 33, 38, 57, 62, 69, 74, 85, 88, 93, 106, 108, 129, 133, 134, 145, 166, 177, 178, 205, 213, 217, 218, 226, 237, 248, 249, 253, 254, 262, 265, 278, 309, 314, 328, 362, 375, 376, 393, 398, 417, 422, 424, 445, 459, 466, 469, 488, 489, 493, 502]

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

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