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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.

A138754 a(n) = PrimePi(A138751(n)) - a variation of the Collatz (3n+1) map.

Table of values

n a(n)
1 1
2 4
3 2
4 7
5 4
6 10
7 5
8 13
9 6
10 7
11 19
12 22
13 9
14 24
15 10
16 10
17 11
18 31
19 33
20 12
21 35
22 38
23 14
24 15
25 45
26 16
27 47
28 17
29 48
30 17
31 55
32 19
33 20
34 60
35 22
36 63
37 66
38 67
39 24
40 24
41 25
42 73
43 25
44 77
45 26
46 79
47 83
48 87
49 31
50 89
51 31
52 31
53 93
54 31
55 32
56 33
57 33
58 101
59 102
60 35
61 104
62 35
63 113
64 37
65 115
66 38
67 122
68 123
69 41
70 126

List of values

[1, 4, 2, 7, 4, 10, 5, 13, 6, 7, 19, 22, 9, 24, 10, 10, 11, 31, 33, 12, 35, 38, 14, 15, 45, 16, 47, 17, 48, 17, 55, 19, 20, 60, 22, 63, 66, 67, 24, 24, 25, 73, 25, 77, 26, 79, 83, 87, 31, 89, 31, 31, 93, 31, 32, 33, 33, 101, 102, 35, 104, 35, 113, 37, 115, 38, 122, 123, 41, 126]

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

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