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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.

A003972 Moebius transform of A003961; a(n) = phi(A003961(n)), where A003961 shifts the prime factorization of n one step towards the larger primes.

Table of values

n a(n)
1 1
2 2
3 4
4 6
5 6
6 8
7 10
8 18
9 20
10 12
11 12
12 24
13 16
14 20
15 24
16 54
17 18
18 40
19 22
20 36
21 40
22 24
23 28
24 72
25 42
26 32
27 100
28 60
29 30
30 48
31 36
32 162
33 48
34 36
35 60
36 120
37 40
38 44
39 64
40 108
41 42
42 80
43 46
44 72
45 120
46 56
47 52
48 216
49 110
50 84
51 72
52 96
53 58
54 200
55 72
56 180
57 88
58 60
59 60
60 144
61 66
62 72
63 200
64 486
65 96
66 96
67 70

List of values

[1, 2, 4, 6, 6, 8, 10, 18, 20, 12, 12, 24, 16, 20, 24, 54, 18, 40, 22, 36, 40, 24, 28, 72, 42, 32, 100, 60, 30, 48, 36, 162, 48, 36, 60, 120, 40, 44, 64, 108, 42, 80, 46, 72, 120, 56, 52, 216, 110, 84, 72, 96, 58, 200, 72, 180, 88, 60, 60, 144, 66, 72, 200, 486, 96, 96, 70]

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

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