A004220 - OEIS

A004220 as a simple table

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

[0,3,5,6,7,8,8,9,10,10,10,11,11,11,12,12,12,13,13, 13,13,13,14,14,14,14,14,14,15,15,15,15,15,15,15, 16,16,16,16,16,16,16,16,16,17,17,17,17,17,17,17, 17,17,17,17,17,18,18,18,18,18,18,18,18,18,18,18, 18,18,18,19]

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

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

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