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.

A354197 a(n) = A064989(sigma(sigma(sigma(A003961(n))))), where A003961 shifts the prime factorization one step towards larger primes, and A064989 shifts it back towards smaller primes.

Table of values

n a(n)
1 1
2 1
3 5
4 2
5 2
6 10
7 5
8 44
9 20
10 11
11 6
12 6
13 5
14 5
15 5
16 3
17 2
18 20
19 10
20 4
21 10
22 12
23 66
24 6
25 58
26 10
27 204
28 204
29 11
30 5
31 10
32 986
33 20
34 2
35 55
36 113
37 20
38 55
39 12
40 2
41 5
42 55
43 5
44 29
45 40
46 132
47 12
48 15
49 40
50 58
51 132
52 10
53 6
54 6
55 6
56 18
57 5
58 8
59 20
60 6
61 22
62 145
63 78
64 262
65 5
66 20
67 10
68 170
69 10
70 40
71 6
72 2486
73 2
74 40
75 50
76 12
77 40
78 12
79 20
80 6
81 60
82 5
83 110
84 20

List of values

[1, 1, 5, 2, 2, 10, 5, 44, 20, 11, 6, 6, 5, 5, 5, 3, 2, 20, 10, 4, 10, 12, 66, 6, 58, 10, 204, 204, 11, 5, 10, 986, 20, 2, 55, 113, 20, 55, 12, 2, 5, 55, 5, 29, 40, 132, 12, 15, 40, 58, 132, 10, 6, 6, 6, 18, 5, 8, 20, 6, 22, 145, 78, 262, 5, 20, 10, 170, 10, 40, 6, 2486, 2, 40, 50, 12, 40, 12, 20, 6, 60, 5, 110, 20]

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

Content is available under The OEIS End-User License Agreement.