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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.

A071823 Number of numbers x <= n with largest prime factor of the form 4k+3.

Table of values

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

List of values

[0, 0, 1, 1, 1, 2, 3, 3, 4, 4, 5, 6, 6, 7, 7, 7, 7, 8, 9, 9, 10, 11, 12, 13, 13, 13, 14, 15, 15, 15, 16, 16, 17, 17, 18, 19, 19, 20, 20, 20, 20, 21, 22, 23, 23, 24, 25, 26, 27, 27, 27, 27, 27, 28, 29, 30, 31, 31, 32, 32, 32, 33, 34, 34, 34, 35, 36, 36, 37, 38, 39, 40, 40, 40, 40, 41]

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

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