A055768 - OEIS

A055768 as a simple table

n	a(n)
1	0
2	1
3	1
4	2
5	3
6	3
7	3
8	3
9	4
10	5
11	5
12	5
13	5
14	5
15	6
16	7
17	8
18	8
19	8
20	8
21	8
22	8
23	9
24	9
25	9
26	9
27	10
28	11
29	11
30	11
31	11
32	11
33	11
34	11
35	12
36	12
37	12
38	12
39	13
40	14
41	15
42	15
43	16
44	16
45	16
46	16
47	16
48	16
49	17
50	17
51	17
52	17
53	17
54	17
55	17
56	18
57	19
58	19
59	19
60	19
61	20
62	21
63	21
64	22
65	22
66	23
67	23
68	23
69	24
70	24
71	24
72	25
73	26
74	26
75	26
76	27
77	28
78	28

[0,1,1,2,3,3,3,3,4,5,5,5,5,5,6,7,8,8,8,8,8,8,9,9, 9,9,10,11,11,11,11,11,11,11,12,12,12,12,13,14,15, 15,16,16,16,16,16,16,17,17,17,17,17,17,17,18,19, 19,19,19,20,21,21,22,22,23,23,23,24,24,24,25,26, 26,26,27,28,28]

n	a(n)
1	0
2	1
3	1
4	2
5	3
6	3
7	3
8	3
9	4
10	5
11	5
12	5
13	5
14	5
15	6
16	7
17	8
18	8
19	8
20	8
21	8
22	8
23	9
24	9
25	9
26	9
27	10
28	11
29	11
30	11
31	11
32	11
33	11
34	11
35	12
36	12
37	12
38	12
39	13
40	14
41	15
42	15
43	16
44	16
45	16
46	16
47	16
48	16
49	17
50	17
51	17
52	17
53	17
54	17
55	17
56	18
57	19
58	19
59	19
60	19
61	20
62	21
63	21
64	22
65	22
66	23
67	23
68	23
69	24
70	24
71	24
72	25
73	26
74	26
75	26
76	27
77	28
78	28

n	a(n)
1	0
2	1
3	1
4	2
5	3
6	3
7	3
8	3
9	4
10	5
11	5
12	5
13	5
14	5
15	6
16	7
17	8
18	8
19	8
20	8
21	8
22	8
23	9
24	9
25	9
26	9
27	10
28	11
29	11
30	11
31	11
32	11
33	11
34	11
35	12
36	12
37	12
38	12
39	13
40	14
41	15
42	15
43	16
44	16
45	16
46	16
47	16
48	16
49	17
50	17
51	17
52	17
53	17
54	17
55	17
56	18
57	19
58	19
59	19
60	19
61	20
62	21
63	21
64	22
65	22
66	23
67	23
68	23
69	24
70	24
71	24
72	25
73	26
74	26
75	26
76	27
77	28
78	28

n	a(n)
1	0
2	1
3	1
4	2
5	3
6	3
7	3
8	3
9	4
10	5
11	5
12	5
13	5
14	5
15	6
16	7
17	8
18	8
19	8
20	8
21	8
22	8
23	9
24	9
25	9
26	9
27	10
28	11
29	11
30	11
31	11
32	11
33	11
34	11
35	12
36	12
37	12
38	12
39	13
40	14
41	15
42	15
43	16
44	16
45	16
46	16
47	16
48	16
49	17
50	17
51	17
52	17
53	17
54	17
55	17
56	18
57	19
58	19
59	19
60	19
61	20
62	21
63	21
64	22
65	22
66	23
67	23
68	23
69	24
70	24
71	24
72	25
73	26
74	26
75	26
76	27
77	28
78	28