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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.

A172480 Odd primes p such that there are as many primitive roots (mod p) in the interval [0,p/2] as in the interval [p/2,p].

Table of values

n a(n)
1 5
2 7
3 13
4 17
5 29
6 31
7 37
8 41
9 43
10 53
11 61
12 67
13 73
14 89
15 97
16 101
17 109
18 113
19 137
20 149
21 157
22 173
23 181
24 193
25 197
26 229
27 233
28 241
29 257
30 269
31 277
32 281
33 293
34 307
35 313
36 317
37 337
38 349
39 353
40 367
41 373
42 389
43 397
44 401
45 409
46 421
47 433
48 449
49 457
50 461
51 487
52 509
53 521
54 541
55 557
56 569

List of values

[5, 7, 13, 17, 29, 31, 37, 41, 43, 53, 61, 67, 73, 89, 97, 101, 109, 113, 137, 149, 157, 173, 181, 193, 197, 229, 233, 241, 257, 269, 277, 281, 293, 307, 313, 317, 337, 349, 353, 367, 373, 389, 397, 401, 409, 421, 433, 449, 457, 461, 487, 509, 521, 541, 557, 569]

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

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