A004721 - OEIS

A004721 as a simple table

n	a(n)
0	0
1	1
2	3
3	4
4	5
5	6
6	7
7	8
8	9
9	10
10	11
11	1
12	13
13	14
14	15
15	16
16	17
17	18
18	19
19	0
20	1
21	3
22	4
23	5
24	6
25	7
26	8
27	9
28	30
29	31
30	3
31	33
32	34
33	35
34	36
35	37
36	38
37	39
38	40
39	41
40	4
41	43
42	44
43	45
44	46
45	47
46	48
47	49
48	50
49	51
50	5
51	53
52	54
53	55
54	56
55	57
56	58
57	59
58	60
59	61
60	6
61	63
62	64
63	65
64	66
65	67
66	68
67	69
68	70
69	71
70	7
71	73
72	74
73	75

[0,1,3,4,5,6,7,8,9,10,11,1,13,14,15,16,17,18,19,0, 1,3,4,5,6,7,8,9,30,31,3,33,34,35,36,37,38,39,40, 41,4,43,44,45,46,47,48,49,50,51,5,53,54,55,56,57, 58,59,60,61,6,63,64,65,66,67,68,69,70,71,7,73,74, 75]

n	a(n)
0	0
1	1
2	3
3	4
4	5
5	6
6	7
7	8
8	9
9	10
10	11
11	1
12	13
13	14
14	15
15	16
16	17
17	18
18	19
19	0
20	1
21	3
22	4
23	5
24	6
25	7
26	8
27	9
28	30
29	31
30	3
31	33
32	34
33	35
34	36
35	37
36	38
37	39
38	40
39	41
40	4
41	43
42	44
43	45
44	46
45	47
46	48
47	49
48	50
49	51
50	5
51	53
52	54
53	55
54	56
55	57
56	58
57	59
58	60
59	61
60	6
61	63
62	64
63	65
64	66
65	67
66	68
67	69
68	70
69	71
70	7
71	73
72	74
73	75

n	a(n)
0	0
1	1
2	3
3	4
4	5
5	6
6	7
7	8
8	9
9	10
10	11
11	1
12	13
13	14
14	15
15	16
16	17
17	18
18	19
19	0
20	1
21	3
22	4
23	5
24	6
25	7
26	8
27	9
28	30
29	31
30	3
31	33
32	34
33	35
34	36
35	37
36	38
37	39
38	40
39	41
40	4
41	43
42	44
43	45
44	46
45	47
46	48
47	49
48	50
49	51
50	5
51	53
52	54
53	55
54	56
55	57
56	58
57	59
58	60
59	61
60	6
61	63
62	64
63	65
64	66
65	67
66	68
67	69
68	70
69	71
70	7
71	73
72	74
73	75

n	a(n)
0	0
1	1
2	3
3	4
4	5
5	6
6	7
7	8
8	9
9	10
10	11
11	1
12	13
13	14
14	15
15	16
16	17
17	18
18	19
19	0
20	1
21	3
22	4
23	5
24	6
25	7
26	8
27	9
28	30
29	31
30	3
31	33
32	34
33	35
34	36
35	37
36	38
37	39
38	40
39	41
40	4
41	43
42	44
43	45
44	46
45	47
46	48
47	49
48	50
49	51
50	5
51	53
52	54
53	55
54	56
55	57
56	58
57	59
58	60
59	61
60	6
61	63
62	64
63	65
64	66
65	67
66	68
67	69
68	70
69	71
70	7
71	73
72	74
73	75