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.

A103292 Numbers k such that sigma(2^k - 1) >= 2(2^k - 1), i.e., the number 2^k - 1 is perfect or abundant.

Table of values

n a(n)
1 12
2 24
3 36
4 40
5 48
6 60
7 72
8 80
9 84
10 90
11 96
12 108
13 120
14 132
15 140
16 144
17 156
18 160
19 168
20 180
21 192
22 200
23 204
24 210
25 216
26 220
27 228
28 240
29 252
30 264
31 270
32 276
33 280
34 288
35 300
36 312
37 320
38 324
39 330
40 336
41 348
42 360
43 372
44 384
45 396
46 400
47 408
48 420
49 432
50 440
51 444
52 450
53 456
54 468
55 480
56 492
57 504

List of values

[12, 24, 36, 40, 48, 60, 72, 80, 84, 90, 96, 108, 120, 132, 140, 144, 156, 160, 168, 180, 192, 200, 204, 210, 216, 220, 228, 240, 252, 264, 270, 276, 280, 288, 300, 312, 320, 324, 330, 336, 348, 360, 372, 384, 396, 400, 408, 420, 432, 440, 444, 450, 456, 468, 480, 492, 504]

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

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