A253591 - OEIS

A253591 as a simple table

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

[2,3,3,3,3,5,7,7,7,7,7,7,7,7,7,7,7,7,11,13,13,13, 13,13,13,13,17,17,17,17,17,17,17,17,17,17,17,17, 17,19,19,19,19,19,19,19,19,23,23,23,23,23,23,23, 23,23,23,29,31,31,31,31,31,31,31,31,31,31]

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

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

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