A051664 - OEIS

A051664 as a simple table

n	a(n)
1	2
2	2
3	3
4	2
5	5
6	3
7	7
8	2
9	3
10	5
11	11
12	3
13	13
14	7
15	7
16	2
17	17
18	3
19	19
20	5
21	9
22	11
23	23
24	3
25	5
26	13
27	3
28	7
29	29
30	7
31	31
32	2
33	15
34	17
35	17
36	3
37	37
38	19
39	17
40	5
41	41
42	9
43	43
44	11
45	7
46	23
47	47
48	3
49	7
50	5
51	23
52	13
53	53
54	3
55	17
56	7
57	25
58	29
59	59
60	7
61	61
62	31
63	9
64	2
65	31
66	15
67	67
68	17
69	31
70	17
71	71
72	3
73	73
74	37
75	7
76	19
77	31
78	17
79	79
80	5
81	3

[2,2,3,2,5,3,7,2,3,5,11,3,13,7,7,2,17,3,19,5,9,11, 23,3,5,13,3,7,29,7,31,2,15,17,17,3,37,19,17,5,41, 9,43,11,7,23,47,3,7,5,23,13,53,3,17,7,25,29,59,7, 61,31,9,2,31,15,67,17,31,17,71,3,73,37,7,19,31,17, 79,5,3]

n	a(n)
1	2
2	2
3	3
4	2
5	5
6	3
7	7
8	2
9	3
10	5
11	11
12	3
13	13
14	7
15	7
16	2
17	17
18	3
19	19
20	5
21	9
22	11
23	23
24	3
25	5
26	13
27	3
28	7
29	29
30	7
31	31
32	2
33	15
34	17
35	17
36	3
37	37
38	19
39	17
40	5
41	41
42	9
43	43
44	11
45	7
46	23
47	47
48	3
49	7
50	5
51	23
52	13
53	53
54	3
55	17
56	7
57	25
58	29
59	59
60	7
61	61
62	31
63	9
64	2
65	31
66	15
67	67
68	17
69	31
70	17
71	71
72	3
73	73
74	37
75	7
76	19
77	31
78	17
79	79
80	5
81	3

n	a(n)
1	2
2	2
3	3
4	2
5	5
6	3
7	7
8	2
9	3
10	5
11	11
12	3
13	13
14	7
15	7
16	2
17	17
18	3
19	19
20	5
21	9
22	11
23	23
24	3
25	5
26	13
27	3
28	7
29	29
30	7
31	31
32	2
33	15
34	17
35	17
36	3
37	37
38	19
39	17
40	5
41	41
42	9
43	43
44	11
45	7
46	23
47	47
48	3
49	7
50	5
51	23
52	13
53	53
54	3
55	17
56	7
57	25
58	29
59	59
60	7
61	61
62	31
63	9
64	2
65	31
66	15
67	67
68	17
69	31
70	17
71	71
72	3
73	73
74	37
75	7
76	19
77	31
78	17
79	79
80	5
81	3

n	a(n)
1	2
2	2
3	3
4	2
5	5
6	3
7	7
8	2
9	3
10	5
11	11
12	3
13	13
14	7
15	7
16	2
17	17
18	3
19	19
20	5
21	9
22	11
23	23
24	3
25	5
26	13
27	3
28	7
29	29
30	7
31	31
32	2
33	15
34	17
35	17
36	3
37	37
38	19
39	17
40	5
41	41
42	9
43	43
44	11
45	7
46	23
47	47
48	3
49	7
50	5
51	23
52	13
53	53
54	3
55	17
56	7
57	25
58	29
59	59
60	7
61	61
62	31
63	9
64	2
65	31
66	15
67	67
68	17
69	31
70	17
71	71
72	3
73	73
74	37
75	7
76	19
77	31
78	17
79	79
80	5
81	3