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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.

A336459 a(n) = A065330(sigma(sigma(n))), where A065330 is fully multiplicative with a(2) = a(3) = 1, and a(p) = p for primes p > 3.

Table of values

n a(n)
1 1
2 1
3 7
4 1
5 1
6 7
7 5
8 1
9 7
10 13
11 7
12 7
13 1
14 5
15 5
16 1
17 13
18 7
19 7
20 1
21 7
22 91
23 5
24 7
25 1
26 1
27 5
28 5
29 1
30 65
31 7
32 13
33 31
34 5
35 31
36 7
37 5
38 7
39 5
40 13
41 1
42 7
43 7
44 7
45 7
46 65
47 31
48 7
49 5
50 1
51 65
52 19
53 5
54 5
55 65
56 5
57 31
58 13
59 7
60 5
61 1
62 7
63 35
64 1
65 7
66 403
67 7
68 13
69 7
70 403
71 65
72 7
73 19
74 5
75 7
76 7
77 7
78 5
79 31
80 1
81 133
82 13
83 7
84 7
85 35
86 7
87 5
88 91
89 13
90 91
91 31
92 5
93 85
94 403

List of values

[1, 1, 7, 1, 1, 7, 5, 1, 7, 13, 7, 7, 1, 5, 5, 1, 13, 7, 7, 1, 7, 91, 5, 7, 1, 1, 5, 5, 1, 65, 7, 13, 31, 5, 31, 7, 5, 7, 5, 13, 1, 7, 7, 7, 7, 65, 31, 7, 5, 1, 65, 19, 5, 5, 65, 5, 31, 13, 7, 5, 1, 7, 35, 1, 7, 403, 7, 13, 7, 403, 65, 7, 19, 5, 7, 7, 7, 5, 31, 1, 133, 13, 7, 7, 35, 7, 5, 91, 13, 91, 31, 5, 85, 403]

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

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