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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.

A307616 a(n) is the smallest k with the property that i / gcd(i, k) is a prime power (or 1) for i = 1..n.

Table of values

n a(n)
1 1
2 1
3 1
4 1
5 1
6 2
7 2
8 2
9 2
10 2
11 2
12 4
13 4
14 4
15 6
16 6
17 6
18 6
19 6
20 12
21 12
22 12
23 12
24 12
25 12
26 12
27 12
28 12
29 12
30 12
31 12
32 12
33 12
34 12
35 60
36 60
37 60
38 60
39 60
40 60
41 60
42 60
43 60
44 60
45 60
46 60
47 60
48 60
49 60
50 60
51 60
52 60
53 60
54 60
55 60
56 120
57 120
58 120
59 120
60 120
61 120
62 120
63 360
64 360
65 360
66 360
67 360
68 360
69 360

List of values

[1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 4, 4, 4, 6, 6, 6, 6, 6, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 120, 120, 120, 120, 120, 120, 120, 360, 360, 360, 360, 360, 360, 360]

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

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