A047595 - OEIS

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A047595 as a simple table

n	a(n)
1	0
2	1
3	2
4	3
5	4
6	5
7	7
8	8
9	9
10	10
11	11
12	12
13	13
14	15
15	16
16	17
17	18
18	19
19	20
20	21
21	23
22	24
23	25
24	26
25	27
26	28
27	29
28	31
29	32
30	33
31	34
32	35
33	36
34	37
35	39
36	40
37	41
38	42
39	43
40	44
41	45
42	47
43	48
44	49
45	50
46	51
47	52
48	53
49	55
50	56
51	57
52	58
53	59
54	60
55	61
56	63
57	64
58	65
59	66
60	67
61	68
62	69
63	71
64	72
65	73
66	74
67	75

[0,1,2,3,4,5,7,8,9,10,11,12,13,15,16,17,18,19,20, 21,23,24,25,26,27,28,29,31,32,33,34,35,36,37,39, 40,41,42,43,44,45,47,48,49,50,51,52,53,55,56,57, 58,59,60,61,63,64,65,66,67,68,69,71,72,73,74,75]

n	a(n)
1	0
2	1
3	2
4	3
5	4
6	5
7	7
8	8
9	9
10	10
11	11
12	12
13	13
14	15
15	16
16	17
17	18
18	19
19	20
20	21
21	23
22	24
23	25
24	26
25	27
26	28
27	29
28	31
29	32
30	33
31	34
32	35
33	36
34	37
35	39
36	40
37	41
38	42
39	43
40	44
41	45
42	47
43	48
44	49
45	50
46	51
47	52
48	53
49	55
50	56
51	57
52	58
53	59
54	60
55	61
56	63
57	64
58	65
59	66
60	67
61	68
62	69
63	71
64	72
65	73
66	74
67	75

n	a(n)
1	0
2	1
3	2
4	3
5	4
6	5
7	7
8	8
9	9
10	10
11	11
12	12
13	13
14	15
15	16
16	17
17	18
18	19
19	20
20	21
21	23
22	24
23	25
24	26
25	27
26	28
27	29
28	31
29	32
30	33
31	34
32	35
33	36
34	37
35	39
36	40
37	41
38	42
39	43
40	44
41	45
42	47
43	48
44	49
45	50
46	51
47	52
48	53
49	55
50	56
51	57
52	58
53	59
54	60
55	61
56	63
57	64
58	65
59	66
60	67
61	68
62	69
63	71
64	72
65	73
66	74
67	75

n	a(n)
1	0
2	1
3	2
4	3
5	4
6	5
7	7
8	8
9	9
10	10
11	11
12	12
13	13
14	15
15	16
16	17
17	18
18	19
19	20
20	21
21	23
22	24
23	25
24	26
25	27
26	28
27	29
28	31
29	32
30	33
31	34
32	35
33	36
34	37
35	39
36	40
37	41
38	42
39	43
40	44
41	45
42	47
43	48
44	49
45	50
46	51
47	52
48	53
49	55
50	56
51	57
52	58
53	59
54	60
55	61
56	63
57	64
58	65
59	66
60	67
61	68
62	69
63	71
64	72
65	73
66	74
67	75