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.

A175253 a(n) = characteristic function of numbers k such that A000203(m) = k has no solution for any m, where A000203(m) = sum of divisors of m.

Table of values

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

List of values

[0, 1, 0, 0, 1, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 1, 1, 0, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 0, 0, 0, 1, 1, 1, 0, 1, 0, 0, 0, 1, 0, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 1, 1, 0, 1, 0, 1, 1, 1, 0, 1]