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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.

A003973 Inverse Möbius transform of A003961; a(n) = sigma(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 4
3 6
4 13
5 8
6 24
7 12
8 40
9 31
10 32
11 14
12 78
13 18
14 48
15 48
16 121
17 20
18 124
19 24
20 104
21 72
22 56
23 30
24 240
25 57
26 72
27 156
28 156
29 32
30 192
31 38
32 364
33 84
34 80
35 96
36 403
37 42
38 96
39 108
40 320
41 44
42 288
43 48
44 182
45 248
46 120
47 54
48 726
49 133
50 228
51 120
52 234
53 60
54 624
55 112
56 480
57 144
58 128
59 62
60 624
61 68

List of values

[1, 4, 6, 13, 8, 24, 12, 40, 31, 32, 14, 78, 18, 48, 48, 121, 20, 124, 24, 104, 72, 56, 30, 240, 57, 72, 156, 156, 32, 192, 38, 364, 84, 80, 96, 403, 42, 96, 108, 320, 44, 288, 48, 182, 248, 120, 54, 726, 133, 228, 120, 234, 60, 624, 112, 480, 144, 128, 62, 624, 68]

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

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