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.

A347684 Array read by antidiagonals: T(n,k) (n>=1, k>=1) = f(n,k), where f(x,y) = x*red_inv(x,y) + y*red_inv(y,x) if gcd(x,y)=1, or 0 if gcd(x,y)>1, and red_inv is defined in the comments.

Table of values

n a(n)
1 0
2 1
3 1
4 1
5 0
6 1
7 1
8 5
9 5
10 1
11 1
12 0
13 0
14 0
15 1
16 1
17 9
18 7
19 7
20 9
21 1
22 1
23 0
24 11
25 0
26 11
27 0
28 1
29 1
30 13
31 0
32 9
33 9
34 0
35 13
36 1
37 1
38 0
39 13
40 0
41 0
42 0
43 13
44 0
45 1
46 1
47 17
48 17
49 15
50 11
51 11
52 15
53 17
54 17
55 1
56 1
57 0
58 0
59 0
60 29
61 0
62 29
63 0
64 0
65 0
66 1
67 1
68 21
69 19
70 17
71 31
72 13
73 13
74 31
75 17
76 19
77 21
78 1
79 1
80 0
81 23
82 0
83 19
84 0
85 0
86 0
87 19
88 0
89 23
90 0
91 1

List of values

[0, 1, 1, 1, 0, 1, 1, 5, 5, 1, 1, 0, 0, 0, 1, 1, 9, 7, 7, 9, 1, 1, 0, 11, 0, 11, 0, 1, 1, 13, 0, 9, 9, 0, 13, 1, 1, 0, 13, 0, 0, 0, 13, 0, 1, 1, 17, 17, 15, 11, 11, 15, 17, 17, 1, 1, 0, 0, 0, 29, 0, 29, 0, 0, 0, 1, 1, 21, 19, 17, 31, 13, 13, 31, 17, 19, 21, 1, 1, 0, 23, 0, 19, 0, 0, 0, 19, 0, 23, 0, 1]