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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.

A079551 a(n) = Sum_{primes p <= n} d(p-1), where d() = A000005.

Table of values

n a(n)
0 0
1 0
2 1
3 3
4 3
5 6
6 6
7 10
8 10
9 10
10 10
11 14
12 14
13 20
14 20
15 20
16 20
17 25
18 25
19 31
20 31
21 31
22 31
23 35
24 35
25 35
26 35
27 35
28 35
29 41
30 41
31 49
32 49
33 49
34 49
35 49
36 49
37 58
38 58
39 58
40 58
41 66
42 66
43 74
44 74
45 74
46 74
47 78
48 78
49 78
50 78
51 78
52 78
53 84
54 84
55 84
56 84
57 84
58 84
59 88
60 88
61 100
62 100
63 100
64 100
65 100
66 100
67 108
68 108
69 108
70 108

List of values

[0, 0, 1, 3, 3, 6, 6, 10, 10, 10, 10, 14, 14, 20, 20, 20, 20, 25, 25, 31, 31, 31, 31, 35, 35, 35, 35, 35, 35, 41, 41, 49, 49, 49, 49, 49, 49, 58, 58, 58, 58, 66, 66, 74, 74, 74, 74, 78, 78, 78, 78, 78, 78, 84, 84, 84, 84, 84, 84, 88, 88, 100, 100, 100, 100, 100, 100, 108, 108, 108, 108]

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

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