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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.

A225748 Numbers n for which the sum of the numbers in the Collatz (3x+1) iteration of n is prime.

Table of values

n a(n)
1 2
2 4
3 12
4 16
5 22
6 38
7 48
8 52
9 64
10 66
11 67
12 90
13 93
14 132
15 148
16 149
17 155
18 163
19 165
20 185
21 201
22 208
23 222
24 229
25 230
26 237
27 242
28 264
29 268
30 275
31 289
32 309
33 324
34 332
35 339
36 351
37 352
38 359
39 362
40 363
41 373
42 382
43 384
44 401
45 403
46 465
47 471
48 474
49 485
50 507
51 517
52 518
53 528
54 532

List of values

[2, 4, 12, 16, 22, 38, 48, 52, 64, 66, 67, 90, 93, 132, 148, 149, 155, 163, 165, 185, 201, 208, 222, 229, 230, 237, 242, 264, 268, 275, 289, 309, 324, 332, 339, 351, 352, 359, 362, 363, 373, 382, 384, 401, 403, 465, 471, 474, 485, 507, 517, 518, 528, 532]