A066683 - OEIS

A066683 as a simple table

n	a(n)
1	0
2	1
3	2
4	2
5	3
6	3
7	4
8	5
9	5
10	5
11	6
12	7
13	8
14	8
15	8
16	8
17	9
18	10
19	11
20	11
21	11
22	11
23	12
24	12
25	12
26	12
27	13
28	13
29	14
30	15
31	16
32	16
33	16
34	16
35	16
36	16
37	17
38	17
39	17
40	17
41	18
42	18
43	19
44	19
45	20
46	20
47	21
48	21
49	21
50	22
51	22
52	22
53	23
54	23
55	23
56	23
57	23
58	23
59	24
60	24
61	25
62	25
63	26
64	26
65	26
66	26

[0,1,2,2,3,3,4,5,5,5,6,7,8,8,8,8,9,10,11,11,11,11, 12,12,12,12,13,13,14,15,16,16,16,16,16,16,17,17, 17,17,18,18,19,19,20,20,21,21,21,22,22,22,23,23, 23,23,23,23,24,24,25,25,26,26,26,26]

[0,1,2,2,3,3,4,5,5,5,6,7,8,8,8,8,9,10,11,11,11,11,
 12,12,12,12,13,13,14,15,16,16,16,16,16,16,17,17,
 17,17,18,18,19,19,20,20,21,21,21,22,22,22,23,23,
 23,23,23,23,24,24,25,25,26,26,26,26]

n	a(n)
1	0
2	1
3	2
4	2
5	3
6	3
7	4
8	5
9	5
10	5
11	6
12	7
13	8
14	8
15	8
16	8
17	9
18	10
19	11
20	11
21	11
22	11
23	12
24	12
25	12
26	12
27	13
28	13
29	14
30	15
31	16
32	16
33	16
34	16
35	16
36	16
37	17
38	17
39	17
40	17
41	18
42	18
43	19
44	19
45	20
46	20
47	21
48	21
49	21
50	22
51	22
52	22
53	23
54	23
55	23
56	23
57	23
58	23
59	24
60	24
61	25
62	25
63	26
64	26
65	26
66	26

n	a(n)
1	0
2	1
3	2
4	2
5	3
6	3
7	4
8	5
9	5
10	5
11	6
12	7
13	8
14	8
15	8
16	8
17	9
18	10
19	11
20	11
21	11
22	11
23	12
24	12
25	12
26	12
27	13
28	13
29	14
30	15
31	16
32	16
33	16
34	16
35	16
36	16
37	17
38	17
39	17
40	17
41	18
42	18
43	19
44	19
45	20
46	20
47	21
48	21
49	21
50	22
51	22
52	22
53	23
54	23
55	23
56	23
57	23
58	23
59	24
60	24
61	25
62	25
63	26
64	26
65	26
66	26

n	a(n)
1	0
2	1
3	2
4	2
5	3
6	3
7	4
8	5
9	5
10	5
11	6
12	7
13	8
14	8
15	8
16	8
17	9
18	10
19	11
20	11
21	11
22	11
23	12
24	12
25	12
26	12
27	13
28	13
29	14
30	15
31	16
32	16
33	16
34	16
35	16
36	16
37	17
38	17
39	17
40	17
41	18
42	18
43	19
44	19
45	20
46	20
47	21
48	21
49	21
50	22
51	22
52	22
53	23
54	23
55	23
56	23
57	23
58	23
59	24
60	24
61	25
62	25
63	26
64	26
65	26
66	26