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.

A349749 Odd numbers k for which the 3-adic valuation of sigma(k) is equal to the 3-adic valuation of k, where sigma is the sum of divisors function.

Table of values

n a(n)
1 1
2 7
3 13
4 15
5 19
6 25
7 31
8 33
9 37
10 43
11 61
12 67
13 69
14 73
15 79
16 87
17 91
18 97
19 103
20 105
21 109
22 121
23 123
24 127
25 133
26 139
27 141
28 147
29 151
30 153
31 157
32 163
33 175
34 177
35 181
36 193
37 195
38 199
39 211
40 217
41 223
42 229
43 231
44 241
45 247
46 249
47 259
48 271
49 277
50 283
51 285
52 289
53 301
54 303
55 307
56 313
57 325
58 331
59 337
60 339
61 343
62 349
63 367
64 373
65 375
66 379
67 393
68 397

List of values

[1, 7, 13, 15, 19, 25, 31, 33, 37, 43, 61, 67, 69, 73, 79, 87, 91, 97, 103, 105, 109, 121, 123, 127, 133, 139, 141, 147, 151, 153, 157, 163, 175, 177, 181, 193, 195, 199, 211, 217, 223, 229, 231, 241, 247, 249, 259, 271, 277, 283, 285, 289, 301, 303, 307, 313, 325, 331, 337, 339, 343, 349, 367, 373, 375, 379, 393, 397]