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.

A109641 Composite n such that binomial(3n, n) == 3^k (mod n) for some integer k > 0.

Table of values

n a(n)
1 4
2 9
3 15
4 25
5 27
6 34
7 36
8 49
9 51
10 57
11 63
12 68
13 75
14 81
15 87
16 93
17 111
18 121
19 125
20 129
21 132
22 138
23 141
24 153
25 155
26 159
27 169
28 177
29 237
30 249
31 258
32 261
33 264
34 267
35 274
36 276
37 279
38 289
39 298
40 303
41 324
42 339
43 343
44 357
45 361
46 375
47 381
48 387
49 393
50 411
51 417
52 423
53 441
54 447
55 453
56 477

List of values

[4, 9, 15, 25, 27, 34, 36, 49, 51, 57, 63, 68, 75, 81, 87, 93, 111, 121, 125, 129, 132, 138, 141, 153, 155, 159, 169, 177, 237, 249, 258, 261, 264, 267, 274, 276, 279, 289, 298, 303, 324, 339, 343, 357, 361, 375, 381, 387, 393, 411, 417, 423, 441, 447, 453, 477]