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.

A374843 Number of indices i in [n] such that in the trajectory of i for the Collatz (3x+1) problem the sum and the number of terms are coprime or the trajectory is not finite.

Table of values

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

List of values

[1, 2, 3, 4, 4, 5, 6, 7, 8, 9, 10, 11, 12, 12, 12, 13, 14, 14, 14, 14, 14, 15, 16, 17, 17, 18, 18, 19, 20, 21, 22, 22, 23, 23, 23, 24, 25, 26, 27, 28, 29, 30, 30, 31, 32, 33, 34, 35, 36, 37, 37, 38, 38, 39, 40, 40, 40, 40, 40, 40, 40, 40, 40, 41, 42, 43, 44, 45]

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

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