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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.

A250189 Numbers n such that Phi(40,n) is prime, where Phi is the cyclotomic polynomial.

Table of values

n a(n)
1 2
2 3
3 4
4 31
5 37
6 39
7 46
8 77
9 98
10 119
11 124
12 143
13 144
14 154
15 169
16 197
17 205
18 232
19 245
20 266
21 291
22 295
23 297
24 305
25 308
26 319
27 332
28 333
29 413
30 426
31 431
32 437
33 454
34 459
35 472
36 483
37 513
38 528
39 531
40 542
41 579
42 617
43 619
44 635
45 647
46 677
47 724
48 737
49 748
50 780
51 806
52 815
53 819
54 820
55 840
56 851
57 858
58 870
59 875
60 907
61 920
62 927
63 940
64 983
65 1002
66 1028

List of values

[2, 3, 4, 31, 37, 39, 46, 77, 98, 119, 124, 143, 144, 154, 169, 197, 205, 232, 245, 266, 291, 295, 297, 305, 308, 319, 332, 333, 413, 426, 431, 437, 454, 459, 472, 483, 513, 528, 531, 542, 579, 617, 619, 635, 647, 677, 724, 737, 748, 780, 806, 815, 819, 820, 840, 851, 858, 870, 875, 907, 920, 927, 940, 983, 1002, 1028]