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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.

A250181 Numbers n such that Phi_26(n) is prime, where Phi is the cyclotomic polynomial.

Table of values

n a(n)
1 2
2 3
3 21
4 22
5 23
6 35
7 39
8 74
9 80
10 84
11 89
12 108
13 114
14 121
15 126
16 134
17 152
18 153
19 171
20 180
21 195
22 204
23 230
24 256
25 263
26 297
27 321
28 326
29 336
30 342
31 345
32 351
33 368
34 390
35 393
36 397
37 398
38 399
39 413
40 427
41 439
42 490
43 525
44 563
45 566
46 574
47 591
48 602
49 609
50 630
51 641
52 652
53 657
54 660
55 667
56 682
57 685
58 694
59 708
60 712
61 716
62 721

List of values

[2, 3, 21, 22, 23, 35, 39, 74, 80, 84, 89, 108, 114, 121, 126, 134, 152, 153, 171, 180, 195, 204, 230, 256, 263, 297, 321, 326, 336, 342, 345, 351, 368, 390, 393, 397, 398, 399, 413, 427, 439, 490, 525, 563, 566, 574, 591, 602, 609, 630, 641, 652, 657, 660, 667, 682, 685, 694, 708, 712, 716, 721]

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

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