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.

A325284 Numbers whose prime indices form an initial interval with a single hole: (1, 2, ..., x, x + 2, ..., m - 1, m), where x can be 0 but must be less than m - 1.

Table of values

n a(n)
1 3
2 9
3 10
4 15
5 20
6 27
7 40
8 42
9 45
10 50
11 70
12 75
13 80
14 81
15 84
16 100
17 105
18 126
19 135
20 140
21 160
22 168
23 200
24 225
25 243
26 250
27 252
28 280
29 294
30 315
31 320
32 330
33 336
34 350
35 375
36 378
37 400
38 405
39 462
40 490
41 500
42 504
43 525
44 560
45 588
46 640
47 660
48 672
49 675
50 700
51 729
52 735
53 756
54 770
55 800

List of values

[3, 9, 10, 15, 20, 27, 40, 42, 45, 50, 70, 75, 80, 81, 84, 100, 105, 126, 135, 140, 160, 168, 200, 225, 243, 250, 252, 280, 294, 315, 320, 330, 336, 350, 375, 378, 400, 405, 462, 490, 500, 504, 525, 560, 588, 640, 660, 672, 675, 700, 729, 735, 756, 770, 800]

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

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