A165842 - OEIS

A165842 as a simple table

n	a(n)
1	1
2	21
3	21
4	441
5	21
6	441
7	21
8	9261
9	441
10	441
11	21
12	9261
13	21
14	441
15	441
16	194481
17	21
18	9261
19	21
20	9261
21	441
22	441
23	21
24	194481
25	441
26	441
27	9261
28	9261
29	21
30	9261
31	21
32	4084101
33	441
34	441
35	441
36	194481
37	21
38	441
39	441
40	194481
41	21
42	9261
43	21
44	9261
45	9261
46	441
47	21
48	4084101
49	441

[1,21,21,441,21,441,21,9261,441,441,21,9261,21, 441,441,194481,21,9261,21,9261,441,441,21,194481, 441,441,9261,9261,21,9261,21,4084101,441,441,441, 194481,21,441,441,194481,21,9261,21,9261,9261,441, 21,4084101,441]