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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.

A317272 Numbers k such that Phi(k,x) is a cyclotomic polynomial with middle coefficient different from -1, 0, 1.

Table of values

n a(n)
1 385
2 770
3 1155
4 1365
5 1540
6 1925
7 2065
8 2145
9 2310
10 2415
11 2465
12 2695
13 2717
14 2730
15 2737
16 2821
17 2849
18 3003
19 3080
20 3255
21 3315
22 3465
23 3619
24 3850
25 4095
26 4130
27 4199
28 4235
29 4277
30 4290
31 4543
32 4620
33 4785
34 4830
35 4845
36 4879
37 4930
38 4991

List of values

[385, 770, 1155, 1365, 1540, 1925, 2065, 2145, 2310, 2415, 2465, 2695, 2717, 2730, 2737, 2821, 2849, 3003, 3080, 3255, 3315, 3465, 3619, 3850, 4095, 4130, 4199, 4235, 4277, 4290, 4543, 4620, 4785, 4830, 4845, 4879, 4930, 4991]

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

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