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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.

A377669 a(n) is the least prime p such that (3^p - 3)/p == n (mod p), or -1 if there is no such prime p.

Table of values

n a(n)
0 11
1 2
2 3
3 5
4 7
5 23
6 43
7 5721619
8 2311
9 105830189
10 31300663
11 13
12 113
13 17
14 821
15 1181
16 19
17 37

List of values

[11, 2, 3, 5, 7, 23, 43, 5721619, 2311, 105830189, 31300663, 13, 113, 17, 821, 1181, 19, 37]