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.

A309200 a(n) is the smallest divisor of the Catalan number C(n) = A000108(n) not already in the sequence.

Table of values

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

List of values

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

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

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