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.

A111907 Numbers k such that the same number of primes, among primes <= the largest prime dividing k, divide k as do not.

Table of values

n a(n)
1 1
2 3
3 9
4 14
5 21
6 27
7 28
8 35
9 56
10 63
11 78
12 81
13 98
14 112
15 130
16 147
17 156
18 175
19 182
20 189
21 195
22 196
23 224
24 234
25 243
26 245
27 260
28 273
29 286
30 312
31 364
32 392
33 429
34 441
35 448
36 455
37 468
38 520
39 567
40 570
41 572
42 585
43 624
44 650
45 686
46 702
47 715
48 728
49 729
50 784
51 798
52 819
53 875
54 896
55 936

List of values

[1, 3, 9, 14, 21, 27, 28, 35, 56, 63, 78, 81, 98, 112, 130, 147, 156, 175, 182, 189, 195, 196, 224, 234, 243, 245, 260, 273, 286, 312, 364, 392, 429, 441, 448, 455, 468, 520, 567, 570, 572, 585, 624, 650, 686, 702, 715, 728, 729, 784, 798, 819, 875, 896, 936]

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

Content is available under The OEIS End-User License Agreement.