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.

A056144 a(1) = 1, a(m+1) = Sum_{k=1..m} gcd(m, a(k)).

Table of values

n a(n)
1 1
2 1
3 2
4 3
5 5
6 9
7 11
8 7
9 9
10 27
11 15
12 21
13 25
14 13
15 27
16 49
17 17
18 33
19 59
20 19
21 33
22 69
23 53
24 45
25 47
26 61
27 39
28 117
29 47
30 29
31 89
32 31
33 33
34 161
35 51
36 75
37 105
38 37
39 57
40 159
41 65
42 41
43 135
44 43
45 85
46 251
47 91
48 139
49 89
50 127
51 127
52 171
53 113
54 157
55 199
56 131
57 93
58 227
59 87
60 117
61 185
62 121
63 123
64 227
65 65

List of values

[1, 1, 2, 3, 5, 9, 11, 7, 9, 27, 15, 21, 25, 13, 27, 49, 17, 33, 59, 19, 33, 69, 53, 45, 47, 61, 39, 117, 47, 29, 89, 31, 33, 161, 51, 75, 105, 37, 57, 159, 65, 41, 135, 43, 85, 251, 91, 139, 89, 127, 127, 171, 113, 157, 199, 131, 93, 227, 87, 117, 185, 121, 123, 227, 65]

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

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