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.

A260640 Numbers n such that binomial(3*n,n) == 0 (mod n).

Table of values

n a(n)
1 1
2 3
3 6
4 12
5 21
6 35
7 44
8 55
9 60
10 70
11 78
12 88
13 90
14 99
15 102
16 110
17 117
18 119
19 120
20 133
21 156
22 171
23 176
24 180
25 184
26 204
27 207
28 220
29 225
30 230
31 231
32 234
33 238
34 240
35 247
36 252
37 255
38 285
39 286
40 300
41 312
42 341
43 342
44 348
45 360
46 368
47 372
48 391
49 403
50 408
51 414
52 425
53 434
54 460
55 462
56 465
57 468
58 481
59 483
60 494
61 495
62 504
63 506
64 510
65 550
66 555
67 561
68 572
69 574
70 585
71 600

List of values

[1, 3, 6, 12, 21, 35, 44, 55, 60, 70, 78, 88, 90, 99, 102, 110, 117, 119, 120, 133, 156, 171, 176, 180, 184, 204, 207, 220, 225, 230, 231, 234, 238, 240, 247, 252, 255, 285, 286, 300, 312, 341, 342, 348, 360, 368, 372, 391, 403, 408, 414, 425, 434, 460, 462, 465, 468, 481, 483, 494, 495, 504, 506, 510, 550, 555, 561, 572, 574, 585, 600]