A047428 - OEIS

A047428 as a simple table

n	a(n)
1	0
2	1
3	3
4	4
5	5
6	6
7	8
8	9
9	11
10	12
11	13
12	14
13	16
14	17
15	19
16	20
17	21
18	22
19	24
20	25
21	27
22	28
23	29
24	30
25	32
26	33
27	35
28	36
29	37
30	38
31	40
32	41
33	43
34	44
35	45
36	46
37	48
38	49
39	51
40	52
41	53
42	54
43	56
44	57
45	59
46	60
47	61
48	62
49	64
50	65
51	67
52	68
53	69
54	70
55	72
56	73
57	75
58	76
59	77
60	78
61	80
62	81
63	83
64	84
65	85
66	86
67	88

[0,1,3,4,5,6,8,9,11,12,13,14,16,17,19,20,21,22,24, 25,27,28,29,30,32,33,35,36,37,38,40,41,43,44,45, 46,48,49,51,52,53,54,56,57,59,60,61,62,64,65,67, 68,69,70,72,73,75,76,77,78,80,81,83,84,85,86,88]

n	a(n)
1	0
2	1
3	3
4	4
5	5
6	6
7	8
8	9
9	11
10	12
11	13
12	14
13	16
14	17
15	19
16	20
17	21
18	22
19	24
20	25
21	27
22	28
23	29
24	30
25	32
26	33
27	35
28	36
29	37
30	38
31	40
32	41
33	43
34	44
35	45
36	46
37	48
38	49
39	51
40	52
41	53
42	54
43	56
44	57
45	59
46	60
47	61
48	62
49	64
50	65
51	67
52	68
53	69
54	70
55	72
56	73
57	75
58	76
59	77
60	78
61	80
62	81
63	83
64	84
65	85
66	86
67	88

n	a(n)
1	0
2	1
3	3
4	4
5	5
6	6
7	8
8	9
9	11
10	12
11	13
12	14
13	16
14	17
15	19
16	20
17	21
18	22
19	24
20	25
21	27
22	28
23	29
24	30
25	32
26	33
27	35
28	36
29	37
30	38
31	40
32	41
33	43
34	44
35	45
36	46
37	48
38	49
39	51
40	52
41	53
42	54
43	56
44	57
45	59
46	60
47	61
48	62
49	64
50	65
51	67
52	68
53	69
54	70
55	72
56	73
57	75
58	76
59	77
60	78
61	80
62	81
63	83
64	84
65	85
66	86
67	88

n	a(n)
1	0
2	1
3	3
4	4
5	5
6	6
7	8
8	9
9	11
10	12
11	13
12	14
13	16
14	17
15	19
16	20
17	21
18	22
19	24
20	25
21	27
22	28
23	29
24	30
25	32
26	33
27	35
28	36
29	37
30	38
31	40
32	41
33	43
34	44
35	45
36	46
37	48
38	49
39	51
40	52
41	53
42	54
43	56
44	57
45	59
46	60
47	61
48	62
49	64
50	65
51	67
52	68
53	69
54	70
55	72
56	73
57	75
58	76
59	77
60	78
61	80
62	81
63	83
64	84
65	85
66	86
67	88