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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.

A355034 a(n) is the least base b >= 2 where the sum of digits of n is a prime number.

Table of values

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

List of values

[3, 2, 3, 2, 2, 2, 4, 2, 2, 2, 2, 2, 2, 3, 8, 2, 2, 2, 2, 2, 2, 3, 2, 2, 2, 5, 2, 3, 3, 2, 4, 2, 2, 2, 2, 2, 2, 3, 2, 2, 2, 3, 2, 3, 4, 2, 2, 2, 2, 3, 2, 3, 3, 2, 2, 3, 4, 2, 6, 2, 2, 3, 18, 2, 2, 2, 2, 2, 2, 3, 2, 2, 2, 3, 2, 3, 6, 2, 2, 2, 2, 3, 2, 3, 4, 2, 2]

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