A189721 - OEIS

A189721 as a simple table

n	a(n)
1	0
2	1
3	2
4	3
5	3
6	3
7	4
8	4
9	4
10	5
11	5
12	5
13	5
14	6
15	7
16	7
17	8
18	9
19	10
20	10
21	10
22	10
23	11
24	12
25	12
26	13
27	14
28	15
29	15
30	15
31	15
32	16
33	17
34	17
35	18
36	19
37	19
38	20
39	21
40	22
41	22
42	22
43	23
44	23
45	23
46	23
47	24
48	25
49	26
50	26
51	26
52	27
53	27
54	27
55	28
56	28
57	28
58	28
59	29
60	30
61	30
62	31
63	32
64	32
65	33
66	34
67	35
68	35
69	35
70	36
71	36
72	36
73	36
74	37
75	38
76	39
77	39
78	39
79	40
80	40
81	40

[0,1,2,3,3,3,4,4,4,5,5,5,5,6,7,7,8,9,10,10,10,10, 11,12,12,13,14,15,15,15,15,16,17,17,18,19,19,20, 21,22,22,22,23,23,23,23,24,25,26,26,26,27,27,27, 28,28,28,28,29,30,30,31,32,32,33,34,35,35,35,36, 36,36,36,37,38,39,39,39,40,40,40]

n	a(n)
1	0
2	1
3	2
4	3
5	3
6	3
7	4
8	4
9	4
10	5
11	5
12	5
13	5
14	6
15	7
16	7
17	8
18	9
19	10
20	10
21	10
22	10
23	11
24	12
25	12
26	13
27	14
28	15
29	15
30	15
31	15
32	16
33	17
34	17
35	18
36	19
37	19
38	20
39	21
40	22
41	22
42	22
43	23
44	23
45	23
46	23
47	24
48	25
49	26
50	26
51	26
52	27
53	27
54	27
55	28
56	28
57	28
58	28
59	29
60	30
61	30
62	31
63	32
64	32
65	33
66	34
67	35
68	35
69	35
70	36
71	36
72	36
73	36
74	37
75	38
76	39
77	39
78	39
79	40
80	40
81	40

n	a(n)
1	0
2	1
3	2
4	3
5	3
6	3
7	4
8	4
9	4
10	5
11	5
12	5
13	5
14	6
15	7
16	7
17	8
18	9
19	10
20	10
21	10
22	10
23	11
24	12
25	12
26	13
27	14
28	15
29	15
30	15
31	15
32	16
33	17
34	17
35	18
36	19
37	19
38	20
39	21
40	22
41	22
42	22
43	23
44	23
45	23
46	23
47	24
48	25
49	26
50	26
51	26
52	27
53	27
54	27
55	28
56	28
57	28
58	28
59	29
60	30
61	30
62	31
63	32
64	32
65	33
66	34
67	35
68	35
69	35
70	36
71	36
72	36
73	36
74	37
75	38
76	39
77	39
78	39
79	40
80	40
81	40

n	a(n)
1	0
2	1
3	2
4	3
5	3
6	3
7	4
8	4
9	4
10	5
11	5
12	5
13	5
14	6
15	7
16	7
17	8
18	9
19	10
20	10
21	10
22	10
23	11
24	12
25	12
26	13
27	14
28	15
29	15
30	15
31	15
32	16
33	17
34	17
35	18
36	19
37	19
38	20
39	21
40	22
41	22
42	22
43	23
44	23
45	23
46	23
47	24
48	25
49	26
50	26
51	26
52	27
53	27
54	27
55	28
56	28
57	28
58	28
59	29
60	30
61	30
62	31
63	32
64	32
65	33
66	34
67	35
68	35
69	35
70	36
71	36
72	36
73	36
74	37
75	38
76	39
77	39
78	39
79	40
80	40
81	40