A028391 - OEIS

A028391 as a simple table

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

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

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

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

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