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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.

A331102 a(n) is the greatest prime number of the form n mod (2^k) for some k > 0, or 0 if no such prime number exists.

Table of values

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

List of values

[0, 0, 2, 3, 0, 5, 2, 7, 0, 0, 2, 11, 0, 13, 2, 7, 0, 17, 2, 19, 0, 5, 2, 23, 0, 0, 2, 11, 0, 29, 2, 31, 0, 0, 2, 3, 0, 37, 2, 7, 0, 41, 2, 43, 0, 13, 2, 47, 0, 17, 2, 19, 0, 53, 2, 23, 0, 0, 2, 59, 0, 61, 2, 31, 0, 0, 2, 67, 0, 5, 2, 71, 0, 73, 2, 11, 0, 13, 2]

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