A070921 - OEIS

A070921 as a simple table

n	a(n)
1	1
2	31
3	31
4	211
5	31
6	961
7	31
8	781
9	211
10	961
11	31
12	6541
13	31
14	961
15	961
16	2101
17	31
18	6541
19	31
20	6541
21	961
22	961
23	31
24	24211
25	211
26	961
27	781
28	6541
29	31
30	29791
31	31
32	4651
33	961
34	961
35	961
36	44521
37	31
38	961
39	961
40	24211
41	31
42	29791
43	31
44	6541
45	6541
46	961
47	31
48	65131
49	211
50	6541

[1,31,31,211,31,961,31,781,211,961,31,6541,31,961, 961,2101,31,6541,31,6541,961,961,31,24211,211,961, 781,6541,31,29791,31,4651,961,961,961,44521,31, 961,961,24211,31,29791,31,6541,6541,961,31,65131, 211,6541]