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.

A033858 Numbers k such that j(k) + ud(k) = d(k), where j(k) = A033831, ud(k) = number of unitary divisors of k (A034444), d(k) = number of divisors of k (A000005).

Table of values

n a(n)
1 1
2 2
3 4
4 8
5 9
6 12
7 20
8 24
9 25
10 27
11 40
12 49
13 54
14 88
15 104
16 120
17 121
18 125
19 135
20 136
21 152
22 168
23 169
24 184
25 189
26 232
27 248
28 250
29 264
30 270
31 280
32 289
33 296
34 297
35 312
36 328
37 343
38 344
39 351
40 361
41 375
42 376
43 378
44 408
45 424
46 440
47 456
48 459
49 472
50 488
51 513
52 520
53 529
54 536
55 568
56 584

List of values

[1, 2, 4, 8, 9, 12, 20, 24, 25, 27, 40, 49, 54, 88, 104, 120, 121, 125, 135, 136, 152, 168, 169, 184, 189, 232, 248, 250, 264, 270, 280, 289, 296, 297, 312, 328, 343, 344, 351, 361, 375, 376, 378, 408, 424, 440, 456, 459, 472, 488, 513, 520, 529, 536, 568, 584]

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

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