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.

A071903 Number of x less than or equal to n and divisible only by primes congruent to 3 mod 4 (i.e., in A004614).

Table of values

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

List of values

[1, 1, 2, 2, 2, 2, 3, 3, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 6, 6, 7, 7, 8, 8, 8, 8, 9, 9, 9, 9, 10, 10, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 12, 12, 12, 12, 13, 13, 14, 14, 14, 14, 14, 14, 14, 14, 15, 15, 16, 16, 16, 16, 17, 17, 17, 17, 18, 18, 19, 19, 20, 20, 20, 20, 20, 20, 21, 21, 22]

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

Content is available under The OEIS End-User License Agreement.