A171710 - OEIS

A171710 as a simple table

n	a(n)
1	3
2	3
3	5
4	5
5	13
6	13
7	13
8	13
9	13
10	13
11	13
12	13
13	21
14	21
15	21
16	21
17	21
18	21
19	21
20	21
21	39
22	39
23	39
24	39
25	39
26	39
27	39
28	39
29	39
30	39
31	39
32	39
33	39
34	39
35	39
36	39
37	39
38	39
39	57
40	57
41	57
42	57
43	57
44	57
45	57
46	57
47	57
48	57
49	57
50	57
51	57
52	57
53	57
54	57
55	57
56	57
57	89
58	89
59	89
60	89
61	89
62	89
63	89
64	89
65	89
66	89
67	89
68	89
69	89
70	89
71	89

[3,3,5,5,13,13,13,13,13,13,13,13,21,21,21,21,21, 21,21,21,39,39,39,39,39,39,39,39,39,39,39,39,39, 39,39,39,39,39,57,57,57,57,57,57,57,57,57,57,57, 57,57,57,57,57,57,57,89,89,89,89,89,89,89,89,89, 89,89,89,89,89,89]

n	a(n)
1	3
2	3
3	5
4	5
5	13
6	13
7	13
8	13
9	13
10	13
11	13
12	13
13	21
14	21
15	21
16	21
17	21
18	21
19	21
20	21
21	39
22	39
23	39
24	39
25	39
26	39
27	39
28	39
29	39
30	39
31	39
32	39
33	39
34	39
35	39
36	39
37	39
38	39
39	57
40	57
41	57
42	57
43	57
44	57
45	57
46	57
47	57
48	57
49	57
50	57
51	57
52	57
53	57
54	57
55	57
56	57
57	89
58	89
59	89
60	89
61	89
62	89
63	89
64	89
65	89
66	89
67	89
68	89
69	89
70	89
71	89

n	a(n)
1	3
2	3
3	5
4	5
5	13
6	13
7	13
8	13
9	13
10	13
11	13
12	13
13	21
14	21
15	21
16	21
17	21
18	21
19	21
20	21
21	39
22	39
23	39
24	39
25	39
26	39
27	39
28	39
29	39
30	39
31	39
32	39
33	39
34	39
35	39
36	39
37	39
38	39
39	57
40	57
41	57
42	57
43	57
44	57
45	57
46	57
47	57
48	57
49	57
50	57
51	57
52	57
53	57
54	57
55	57
56	57
57	89
58	89
59	89
60	89
61	89
62	89
63	89
64	89
65	89
66	89
67	89
68	89
69	89
70	89
71	89

n	a(n)
1	3
2	3
3	5
4	5
5	13
6	13
7	13
8	13
9	13
10	13
11	13
12	13
13	21
14	21
15	21
16	21
17	21
18	21
19	21
20	21
21	39
22	39
23	39
24	39
25	39
26	39
27	39
28	39
29	39
30	39
31	39
32	39
33	39
34	39
35	39
36	39
37	39
38	39
39	57
40	57
41	57
42	57
43	57
44	57
45	57
46	57
47	57
48	57
49	57
50	57
51	57
52	57
53	57
54	57
55	57
56	57
57	89
58	89
59	89
60	89
61	89
62	89
63	89
64	89
65	89
66	89
67	89
68	89
69	89
70	89
71	89