A047784 - OEIS

A047784 as a simple table

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

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

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

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

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