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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.

A070020 At these values of k the first, 2nd and 3rd cyclotomic polynomials all give prime numbers.

Table of values

n a(n)
1 6
2 12
3 138
4 150
5 192
6 348
7 642
8 1020
9 1092
10 1230
11 1620
12 1788
13 1932
14 2112
15 2142
16 2238
17 2658
18 2688
19 2730
20 3330
21 3540
22 3918
23 4002
24 4158
25 5010
26 5640
27 6090
28 6450
29 6552
30 6702
31 7950
32 8088
33 9000
34 9042
35 9240
36 9462
37 9768
38 10008
39 10092
40 10272
41 10302
42 10332

List of values

[6, 12, 138, 150, 192, 348, 642, 1020, 1092, 1230, 1620, 1788, 1932, 2112, 2142, 2238, 2658, 2688, 2730, 3330, 3540, 3918, 4002, 4158, 5010, 5640, 6090, 6450, 6552, 6702, 7950, 8088, 9000, 9042, 9240, 9462, 9768, 10008, 10092, 10272, 10302, 10332]

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

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