A271980 - OEIS

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A271980 as a simple table

n	a(n)
1	0
2	1
3	2
4	3
5	4
6	5
7	6
8	7
9	8
10	9
11	10
12	11
13	12
14	13
15	14
16	15
17	16
18	17
19	19
20	20
21	21
22	22
23	23
24	25
25	26
26	29
27	30
28	31
29	32
30	33
31	34
32	35
33	38
34	39
35	40
36	41
37	42
38	44
39	45
40	46
41	48
42	49
43	51
44	52
45	53
46	54
47	55
48	57
49	58
50	59
51	60
52	63
53	64
54	66
55	68
56	69
57	70
58	71
59	72
60	79
61	84
62	86
63	88
64	89
65	90
66	91
67	92

[0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,19, 20,21,22,23,25,26,29,30,31,32,33,34,35,38,39,40, 41,42,44,45,46,48,49,51,52,53,54,55,57,58,59,60, 63,64,66,68,69,70,71,72,79,84,86,88,89,90,91,92]

n	a(n)
1	0
2	1
3	2
4	3
5	4
6	5
7	6
8	7
9	8
10	9
11	10
12	11
13	12
14	13
15	14
16	15
17	16
18	17
19	19
20	20
21	21
22	22
23	23
24	25
25	26
26	29
27	30
28	31
29	32
30	33
31	34
32	35
33	38
34	39
35	40
36	41
37	42
38	44
39	45
40	46
41	48
42	49
43	51
44	52
45	53
46	54
47	55
48	57
49	58
50	59
51	60
52	63
53	64
54	66
55	68
56	69
57	70
58	71
59	72
60	79
61	84
62	86
63	88
64	89
65	90
66	91
67	92

n	a(n)
1	0
2	1
3	2
4	3
5	4
6	5
7	6
8	7
9	8
10	9
11	10
12	11
13	12
14	13
15	14
16	15
17	16
18	17
19	19
20	20
21	21
22	22
23	23
24	25
25	26
26	29
27	30
28	31
29	32
30	33
31	34
32	35
33	38
34	39
35	40
36	41
37	42
38	44
39	45
40	46
41	48
42	49
43	51
44	52
45	53
46	54
47	55
48	57
49	58
50	59
51	60
52	63
53	64
54	66
55	68
56	69
57	70
58	71
59	72
60	79
61	84
62	86
63	88
64	89
65	90
66	91
67	92

n	a(n)
1	0
2	1
3	2
4	3
5	4
6	5
7	6
8	7
9	8
10	9
11	10
12	11
13	12
14	13
15	14
16	15
17	16
18	17
19	19
20	20
21	21
22	22
23	23
24	25
25	26
26	29
27	30
28	31
29	32
30	33
31	34
32	35
33	38
34	39
35	40
36	41
37	42
38	44
39	45
40	46
41	48
42	49
43	51
44	52
45	53
46	54
47	55
48	57
49	58
50	59
51	60
52	63
53	64
54	66
55	68
56	69
57	70
58	71
59	72
60	79
61	84
62	86
63	88
64	89
65	90
66	91
67	92