A004001 - OEIS

A004001 as a simple table

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

[1,1,2,2,3,4,4,4,5,6,7,7,8,8,8,8,9,10,11,12,12,13, 14,14,15,15,15,16,16,16,16,16,17,18,19,20,21,21, 22,23,24,24,25,26,26,27,27,27,28,29,29,30,30,30, 31,31,31,31,32,32,32,32,32,32,33,34,35,36,37,38, 38,39,40,41,42]

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

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

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