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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.

A294509 a(n) is the least value of pi(n*m) - pi(n)*pi(m) for any positive m <= n.

Table of values

n a(n)
1 0
2 1
3 0
4 1
5 0
6 1
7 -1
8 0
9 1
10 2
11 1
12 1
13 0
14 1
15 2
16 3
17 1
18 2
19 0
20 1
21 2
22 2
23 1
24 2
25 3
26 3
27 4
28 5
29 3
30 4
31 2
32 2
33 3
34 4
35 5
36 6
37 5
38 6
39 6
40 6
41 4
42 4
43 3
44 4
45 4
46 5
47 4
48 4
49 4
50 5
51 6
52 6
53 5
54 5
55 6
56 7
57 7
58 8
59 6
60 7
61 6
62 6
63 6
64 7
65 8
66 9
67 8
68 8
69 8
70 8
71 7
72 7
73 5
74 5
75 6
76 7
77 8
78 9
79 7
80 8
81 9
82 9
83 7
84 8
85 8
86 9
87 9
88 10
89 8
90 9
91 10
92 10
93 11
94 12
95 13
96 13
97 11
98 12
99 12
100 12
101 10
102 10
103 9
104 10
105 11

List of values

[0, 1, 0, 1, 0, 1, -1, 0, 1, 2, 1, 1, 0, 1, 2, 3, 1, 2, 0, 1, 2, 2, 1, 2, 3, 3, 4, 5, 3, 4, 2, 2, 3, 4, 5, 6, 5, 6, 6, 6, 4, 4, 3, 4, 4, 5, 4, 4, 4, 5, 6, 6, 5, 5, 6, 7, 7, 8, 6, 7, 6, 6, 6, 7, 8, 9, 8, 8, 8, 8, 7, 7, 5, 5, 6, 7, 8, 9, 7, 8, 9, 9, 7, 8, 8, 9, 9, 10, 8, 9, 10, 10, 11, 12, 13, 13, 11, 12, 12, 12, 10, 10, 9, 10, 11]