A007828 - OEIS

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A007828 as a simple table

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

[0,1,1,2,1,3,2,3,2,3,3,5,3,4,3,5,4,5,4,5,4,5,5,7, 5,6,5,6,6,7,6,7,6,7,6,8,7,7,7,8,7,8,7,8,8,8,8,9,8, 9,8,9,8,9,9,9,9,9,9,10,9,9,9,10]