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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.

A081304 Number of numbers m <= n with prime factors less than 2*spf(m), where spf(m) is the smallest prime factor of m (A020639).

Table of values

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

List of values

[1, 2, 3, 4, 5, 6, 7, 8, 9, 9, 10, 11, 12, 12, 13, 14, 15, 16, 17, 17, 17, 17, 18, 19, 20, 20, 21, 21, 22, 22, 23, 24, 24, 24, 25, 26, 27, 27, 27, 27, 28, 28, 29, 29, 30, 30, 31, 32, 33, 33, 33, 33, 34, 35, 35, 35, 35, 35, 36, 36, 37, 37, 37, 38, 38, 38, 39, 39, 39, 39, 40, 41, 42]

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

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