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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.

A134518 Least k such that the cyclotomic polynomial Phi(k,x) contains n or -n as a coefficient, where k is restricted to be the product of 3 distinct prime numbers.

Table of values

n a(n)
2 105
3 385
4 2431
5 2717
6 8671
7 17119
8 19499
9 20213
10 20213
11 34891
12 34891
13 93439
14 93439
15 93439
16 93439
17 93439
18 282367
19 282367
20 282367
21 282367
22 282367
23 282367
24 282367
25 282367
26 282367
27 617927
28 617927
29 849647
30 849647
31 849647
32 849647
33 849647
34 874507

List of values

[105, 385, 2431, 2717, 8671, 17119, 19499, 20213, 20213, 34891, 34891, 93439, 93439, 93439, 93439, 93439, 282367, 282367, 282367, 282367, 282367, 282367, 282367, 282367, 282367, 617927, 617927, 849647, 849647, 849647, 849647, 849647, 874507]

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

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