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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.

A173013 a(1) = 1, for n >= 2; a(n) = the smallest number h such that sigma(h) = A000203(h) = a(n-1) + 3, a(n) = 0 if no such number exists.

Table of values

n a(n)
1 1
2 3
3 5
4 7
5 0
6 2
7 0
8 2
9 0
10 2
11 0
12 2
13 0
14 2
15 0
16 2
17 0
18 2
19 0
20 2
21 0
22 2
23 0
24 2
25 0
26 2
27 0
28 2
29 0
30 2
31 0
32 2
33 0
34 2
35 0
36 2
37 0
38 2
39 0
40 2
41 0
42 2
43 0
44 2
45 0
46 2
47 0
48 2
49 0
50 2
51 0
52 2

List of values

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

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