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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.

A087634 Primes p such that the equation phi(x) = 4p has a solution, where phi is the totient function.

Table of values

n a(n)
1 2
2 3
3 5
4 7
5 11
6 13
7 23
8 29
9 37
10 41
11 43
12 53
13 67
14 73
15 79
16 83
17 89
18 97
19 113
20 127
21 131
22 139
23 163
24 173
25 179
26 191
27 193
28 199
29 233
30 239
31 251
32 277
33 281
34 293
35 307
36 359
37 373
38 409
39 419
40 431
41 433
42 443
43 487
44 491
45 499
46 509
47 577
48 593
49 619
50 641
51 653
52 659
53 673
54 683
55 709
56 719
57 727

List of values

[2, 3, 5, 7, 11, 13, 23, 29, 37, 41, 43, 53, 67, 73, 79, 83, 89, 97, 113, 127, 131, 139, 163, 173, 179, 191, 193, 199, 233, 239, 251, 277, 281, 293, 307, 359, 373, 409, 419, 431, 433, 443, 487, 491, 499, 509, 577, 593, 619, 641, 653, 659, 673, 683, 709, 719, 727]

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

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