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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.

A230498 a(n) is the minimal odd odious k>1, such that k^i, i=2,...,n, all are evil, and a(n)=0, if there is no such k.

Table of values

n a(n)
2 13
3 21
4 21
5 47
6 265
7 607
8 883
9 883
10 883
11 883
12 10865
13 10865
14 58241
15 58241
16 58241
17 75781
18 367815
19 766165
20 2931371
21 5288671
22 5288671
23 14838843
24 14838843
25 14838843
26 33417397
27 737812313
28 2774333869
29 3513898753
30 3513898753
31 3513898753
32 14369883465
33 14369883465
34 22865025261

List of values

[13, 21, 21, 47, 265, 607, 883, 883, 883, 883, 10865, 10865, 58241, 58241, 58241, 75781, 367815, 766165, 2931371, 5288671, 5288671, 14838843, 14838843, 14838843, 33417397, 737812313, 2774333869, 3513898753, 3513898753, 3513898753, 14369883465, 14369883465, 22865025261]