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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.

A359063 Integers k such that A005420(k) = A005420(2*k) = A005420(4*k) where A005420(k) is the largest prime factor of 2^k-1.

Table of values

n a(n)
1 7
2 13
3 17
4 31
5 37
6 59
7 61
8 65
9 77
10 83
11 89
12 97
13 107
14 127
15 129
16 131
17 133
18 145
19 153
20 165
21 169
22 179
23 195
24 197
25 201
26 221
27 227
28 235
29 245
30 249
31 261
32 269
33 281
34 293
35 297
36 303
37 321
38 325
39 345
40 369
41 373
42 381
43 393
44 399
45 405
46 409
47 417
48 421
49 425
50 427
51 442
52 443
53 447
54 455
55 465

List of values

[7, 13, 17, 31, 37, 59, 61, 65, 77, 83, 89, 97, 107, 127, 129, 131, 133, 145, 153, 165, 169, 179, 195, 197, 201, 221, 227, 235, 245, 249, 261, 269, 281, 293, 297, 303, 321, 325, 345, 369, 373, 381, 393, 399, 405, 409, 417, 421, 425, 427, 442, 443, 447, 455, 465]

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

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