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.

A147809 Half the number of proper divisors (> 1) of n^2 + 1, i.e., tau(n^2 + 1)/2 - 1.

Table of values

n a(n)
1 0
2 0
3 1
4 0
5 1
6 0
7 2
8 1
9 1
10 0
11 1
12 1
13 3
14 0
15 1
16 0
17 3
18 2
19 1
20 0
21 3
22 1
23 3
24 0
25 1
26 0
27 3
28 1
29 1
30 1
31 3
32 2
33 3
34 1
35 1
36 0
37 3
38 2
39 1
40 0
41 2
42 1
43 5
44 1
45 1
46 1
47 7
48 1
49 1
50 1
51 1
52 1
53 3
54 0
55 3
56 0
57 7
58 1
59 1
60 1
61 1
62 1
63 3
64 1
65 1
66 0
67 3
68 3
69 1
70 2
71 1
72 3
73 7
74 0
75 3
76 1
77 3
78 1
79 1
80 1
81 3
82 2
83 7
84 0
85 1
86 1
87 3
88 1
89 3
90 0
91 3
92 1
93 5
94 0
95 1
96 1
97 3
98 3
99 5

List of values

[0, 0, 1, 0, 1, 0, 2, 1, 1, 0, 1, 1, 3, 0, 1, 0, 3, 2, 1, 0, 3, 1, 3, 0, 1, 0, 3, 1, 1, 1, 3, 2, 3, 1, 1, 0, 3, 2, 1, 0, 2, 1, 5, 1, 1, 1, 7, 1, 1, 1, 1, 1, 3, 0, 3, 0, 7, 1, 1, 1, 1, 1, 3, 1, 1, 0, 3, 3, 1, 2, 1, 3, 7, 0, 3, 1, 3, 1, 1, 1, 3, 2, 7, 0, 1, 1, 3, 1, 3, 0, 3, 1, 5, 0, 1, 1, 3, 3, 5]