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.

A166123 If n is prime, a(n) = 1; otherwise, a(n) is gcd(n, d) where d is the denominator of the (n-1)-th Bernoulli number.

Table of values

n a(n)
1 1
2 1
3 1
4 1
5 1
6 1
7 1
8 1
9 3
10 1
11 1
12 1
13 1
14 1
15 3
16 1
17 1
18 1
19 1
20 1
21 3
22 1
23 1
24 1
25 5
26 1
27 3
28 1
29 1
30 1
31 1
32 1
33 3
34 1
35 1
36 1
37 1
38 1
39 3
40 1
41 1
42 1
43 1
44 1
45 15
46 1
47 1
48 1
49 7
50 1
51 3
52 1
53 1
54 1
55 1
56 1
57 3
58 1
59 1
60 1
61 1
62 1
63 3
64 1
65 5
66 1
67 1
68 1
69 3
70 1
71 1
72 1
73 1
74 1
75 3
76 1
77 1
78 1
79 1
80 1
81 3
82 1
83 1
84 1
85 5
86 1
87 3
88 1
89 1
90 1
91 7
92 1
93 3
94 1
95 1
96 1
97 1
98 1
99 3
100 1

List of values

[1, 1, 1, 1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 1, 3, 1, 1, 1, 5, 1, 3, 1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 1, 15, 1, 1, 1, 7, 1, 3, 1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 1, 3, 1, 5, 1, 1, 1, 3, 1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 1, 3, 1, 1, 1, 5, 1, 3, 1, 1, 1, 7, 1, 3, 1, 1, 1, 1, 1, 3, 1]