A071521 - OEIS

A071521 as a simple table

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

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

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

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

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