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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.

A276711 Number of primes p <= n such that n - p is a perfect power (including 0 and 1).

Table of values

n a(n)
1 0
2 1
3 2
4 1
5 1
6 2
7 2
8 1
9 1
10 1
11 4
12 2
13 2
14 2
15 2
16 1
17 2
18 2
19 3
20 2
21 3
22 1
23 3
24 1
25 1
26 1
27 4
28 2
29 3
30 3
31 2
32 4
33 2
34 2
35 3
36 1
37 3
38 5
39 4
40 2
41 3
42 2
43 3
44 3
45 4
46 2
47 4
48 2
49 3
50 2
51 4
52 2
53 3
54 3
55 3
56 4
57 2
58 1
59 3
60 2
61 3
62 4
63 3
64 1
65 2
66 3
67 4
68 5
69 4
70 2
71 3
72 3
73 3
74 2
75 5
76 1
77 4
78 2
79 4
80 4

List of values

[0, 1, 2, 1, 1, 2, 2, 1, 1, 1, 4, 2, 2, 2, 2, 1, 2, 2, 3, 2, 3, 1, 3, 1, 1, 1, 4, 2, 3, 3, 2, 4, 2, 2, 3, 1, 3, 5, 4, 2, 3, 2, 3, 3, 4, 2, 4, 2, 3, 2, 4, 2, 3, 3, 3, 4, 2, 1, 3, 2, 3, 4, 3, 1, 2, 3, 4, 5, 4, 2, 3, 3, 3, 2, 5, 1, 4, 2, 4, 4]

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