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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.

A071824 Number of integers <= n whose largest prime factor is of the form 4*k+1.

Table of values

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

List of values

[0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 3, 3, 4, 4, 5, 5, 5, 6, 6, 6, 6, 6, 7, 8, 8, 8, 9, 10, 10, 10, 10, 11, 11, 11, 12, 12, 13, 14, 15, 15, 15, 15, 16, 16, 16, 16, 16, 17, 18, 19, 20, 20, 20, 20, 20, 21, 21, 22, 23, 23, 23, 23, 24, 24, 24, 25, 25, 25, 25, 25, 26, 27, 28, 28, 28, 29, 29]

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

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