cp's OEIS Frontend

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.

A291440 a(n) = pi(n^2) - pi(n)^2, where pi(n) = A000720(n).

Table of values

n a(n)
1 0
2 1
3 0
4 2
5 0
6 2
7 -1
8 2
9 6
10 9
11 5
12 9
13 3
14 8
15 12
16 18
17 12
18 17
19 8
20 14
21 21
22 28
23 18
24 24
25 33
26 41
27 48
28 56
29 46
30 54
31 41
32 51
33 60
34 70
35 79
36 89
37 75
38 84
39 96
40 107
41 94
42 105
43 87
44 99
45 110
46 123
47 104
48 117
49 132
50 142
51 153
52 168
53 153
54 165
55 178
56 189
57 201
58 218
59 198
60 214
61 195
62 208
63 225
64 240
65 254
66 270
67 248
68 263
69 280
70 293
71 275
72 290
73 264
74 281
75 298
76 316
77 338
78 352
79 327
80 350

List of values

[0, 1, 0, 2, 0, 2, -1, 2, 6, 9, 5, 9, 3, 8, 12, 18, 12, 17, 8, 14, 21, 28, 18, 24, 33, 41, 48, 56, 46, 54, 41, 51, 60, 70, 79, 89, 75, 84, 96, 107, 94, 105, 87, 99, 110, 123, 104, 117, 132, 142, 153, 168, 153, 165, 178, 189, 201, 218, 198, 214, 195, 208, 225, 240, 254, 270, 248, 263, 280, 293, 275, 290, 264, 281, 298, 316, 338, 352, 327, 350]