cp's OEIS Frontend

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.

A189241 Smallest prime factor of 3^n+1 having the form 2*k*n+1.

Table of values

n a(n)
2 5
3 7
4 41
5 61
6 73
7 547
8 17
9 19
10 1181
11 67
12 6481
13 398581
14 29
15 31
16 21523361
17 103
18 73
19 2851
20 41
21 43
22 5501
23 23535794707
24 97
25 151
26 53
27 19441
28 430697
29 523
30 47763361
31 6883
32 926510094425921
33 67
34 956353
35 374857981681
36 6481
37 18427
38 5301533
39 79
40 14401

List of values

[5, 7, 41, 61, 73, 547, 17, 19, 1181, 67, 6481, 398581, 29, 31, 21523361, 103, 73, 2851, 41, 43, 5501, 23535794707, 97, 151, 53, 19441, 430697, 523, 47763361, 6883, 926510094425921, 67, 956353, 374857981681, 6481, 18427, 5301533, 79, 14401]

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

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