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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.

A072917 a(n) = p(n) - phi(n), where p(n) is the least prime greater than phi(n).

Table of values

n a(n)
1 1
2 1
3 1
4 1
5 1
6 1
7 1
8 1
9 1
10 1
11 1
12 1
13 1
14 1
15 3
16 3
17 1
18 1
19 1
20 3
21 1
22 1
23 1
24 3
25 3
26 1
27 1
28 1
29 1
30 3
31 1
32 1
33 3
34 1
35 5
36 1
37 1
38 1
39 5
40 1
41 1
42 1
43 1
44 3
45 5
46 1
47 1
48 1
49 1
50 3
51 5
52 5
53 1
54 1
55 1
56 5
57 1
58 1
59 1
60 1
61 1
62 1
63 1
64 5
65 5
66 3
67 1
68 5
69 3
70 5
71 1
72 5
73 1
74 1
75 1
76 1
77 1
78 5
79 1
80 5
81 5
82 1
83 1
84 5
85 3
86 1
87 3
88 1
89 1
90 5
91 1
92 3
93 1
94 1
95 1
96 5
97 1
98 1
99 1
100 1

List of values

[1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 1, 1, 1, 3, 1, 1, 1, 3, 3, 1, 1, 1, 1, 3, 1, 1, 3, 1, 5, 1, 1, 1, 5, 1, 1, 1, 1, 3, 5, 1, 1, 1, 1, 3, 5, 5, 1, 1, 1, 5, 1, 1, 1, 1, 1, 1, 1, 5, 5, 3, 1, 5, 3, 5, 1, 5, 1, 1, 1, 1, 1, 5, 1, 5, 5, 1, 1, 5, 3, 1, 3, 1, 1, 5, 1, 3, 1, 1, 1, 5, 1, 1, 1, 1]