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.

A212308 Numbers with no proper divisor that is not in an arithmetic progression of at least three proper divisors.

Table of values

n a(n)
1 1
2 6
3 12
4 15
5 18
6 24
7 30
8 36
9 45
10 48
11 54
12 60
13 66
14 72
15 75
16 84
17 90
18 91
19 96
20 108
21 120
22 132
23 135
24 144
25 150
26 162
27 168
28 180
29 192
30 198
31 216
32 225
33 240
34 252
35 264
36 270
37 276
38 288
39 300
40 306
41 312
42 324
43 330
44 336
45 360
46 375
47 384
48 396
49 405
50 420
51 432
52 435
53 450
54 480
55 486
56 504

List of values

[1, 6, 12, 15, 18, 24, 30, 36, 45, 48, 54, 60, 66, 72, 75, 84, 90, 91, 96, 108, 120, 132, 135, 144, 150, 162, 168, 180, 192, 198, 216, 225, 240, 252, 264, 270, 276, 288, 300, 306, 312, 324, 330, 336, 360, 375, 384, 396, 405, 420, 432, 435, 450, 480, 486, 504]

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

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