A213521 - OEIS

A213521 as a simple table

n	a(n)
1	2
2	11
3	29
4	37
5	37
6	127
7	127
8	127
9	127
10	149
11	149
12	211
13	223
14	223
15	307
16	307
17	331
18	331
19	331
20	331
21	541
22	541
23	541
24	541
25	541
26	541
27	541
28	1361
29	1361
30	1361
31	1361
32	1361
33	1361
34	1361
35	1361
36	1361
37	1361
38	1361
39	1361
40	1361
41	1361
42	1361
43	1361
44	1361
45	1361
46	1361
47	1361
48	1361

[2,11,29,37,37,127,127,127,127,149,149,211,223, 223,307,307,331,331,331,331,541,541,541,541,541, 541,541,1361,1361,1361,1361,1361,1361,1361,1361, 1361,1361,1361,1361,1361,1361,1361,1361,1361,1361, 1361,1361,1361]