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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.

A249140 To obtain a(n), write the n-th composite number as a product of primes, subtract 1 from each prime and multiply.

Table of values

n a(n)
1 1
2 2
3 1
4 4
5 4
6 2
7 6
8 8
9 1
10 4
11 4
12 12
13 10
14 2
15 16
16 12
17 8
18 6
19 8
20 1
21 20
22 16
23 24
24 4
25 18
26 24
27 4
28 12
29 10
30 16
31 22
32 2
33 36
34 16
35 32
36 12
37 8
38 40
39 6
40 36
41 28
42 8
43 30
44 24
45 1
46 48
47 20
48 16
49 44
50 24
51 4
52 36
53 32
54 18
55 60
56 24
57 4
58 16
59 40
60 12
61 64
62 42
63 56
64 10
65 16
66 72
67 22
68 60
69 46
70 72
71 2

List of values

[1, 2, 1, 4, 4, 2, 6, 8, 1, 4, 4, 12, 10, 2, 16, 12, 8, 6, 8, 1, 20, 16, 24, 4, 18, 24, 4, 12, 10, 16, 22, 2, 36, 16, 32, 12, 8, 40, 6, 36, 28, 8, 30, 24, 1, 48, 20, 16, 44, 24, 4, 36, 32, 18, 60, 24, 4, 16, 40, 12, 64, 42, 56, 10, 16, 72, 22, 60, 46, 72, 2]

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

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