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.

A082420 Numbers n such that P(n) < P(n+2) < P(n+1), where P(n) = largest prime factor of n (A006530).

Table of values

n a(n)
1 4
2 12
3 16
4 18
5 36
6 40
7 42
8 48
9 50
10 54
11 60
12 64
13 66
14 72
15 75
16 85
17 96
18 100
19 108
20 112
21 117
22 121
23 128
24 136
25 150
26 154
27 156
28 162
29 180
30 182
31 184
32 192
33 196
34 210
35 217
36 228
37 240
38 243
39 245
40 250
41 256
42 264
43 266
44 270
45 276
46 280
47 282
48 290
49 294
50 297
51 301
52 308
53 312
54 320
55 325
56 330
57 333
58 336

List of values

[4, 12, 16, 18, 36, 40, 42, 48, 50, 54, 60, 64, 66, 72, 75, 85, 96, 100, 108, 112, 117, 121, 128, 136, 150, 154, 156, 162, 180, 182, 184, 192, 196, 210, 217, 228, 240, 243, 245, 250, 256, 264, 266, 270, 276, 280, 282, 290, 294, 297, 301, 308, 312, 320, 325, 330, 333, 336]

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

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