A329447 - cp's OEIS frontend

A329447 Start with a(0)=0; thereafter, look left and identify the least frequent digit d so far (in case of a tie, choose the smallest d): after then a(n) = 10c + d, where c > 0 is the number of times d has appeared so far.

n	a(n)
0	0
1	10
2	11
3	20
4	12
5	22
6	30
7	13
8	23
9	33
10	40
11	14
12	24
13	34
14	44
15	50
16	15
17	25
18	35
19	45
20	55
21	60
22	16
23	26
24	36
25	46
26	56
27	66
28	70
29	17
30	27
31	37
32	47
33	57
34	67
35	77
36	80
37	18
38	28
39	38
40	48
41	58
42	68
43	78
44	88
45	90
46	19
47	29
48	39
49	49
50	59
51	69
52	79
53	89
54	99
55	100
56	112
57	113
58	114
59	115
60	116
61	117
62	118
63	119
64	120
65	123
66	124
67	125
68	126
69	127
70	128
71	129

[0, 10, 11, 20, 12, 22, 30, 13, 23, 33, 40, 14, 24, 34, 44, 50, 15, 25, 35, 45, 55, 60, 16, 26, 36, 46, 56, 66, 70, 17, 27, 37, 47, 57, 67, 77, 80, 18, 28, 38, 48, 58, 68, 78, 88, 90, 19, 29, 39, 49, 59, 69, 79, 89, 99, 100, 112, 113, 114, 115, 116, 117, 118, 119, 120, 123, 124, 125, 126, 127, 128, 129]

cp's OEIS Frontend

A329447 Start with a(0)=0; thereafter, look left and identify the least frequent digit d so far (in case of a tie, choose the smallest d): after then a(n) = 10c + d, where c > 0 is the number of times d has appeared so far.

Table of values

List of values

n	a(n)
0	0
1	10
2	11
3	20
4	12
5	22
6	30
7	13
8	23
9	33
10	40
11	14
12	24
13	34
14	44
15	50
16	15
17	25
18	35
19	45
20	55
21	60
22	16
23	26
24	36
25	46
26	56
27	66
28	70
29	17
30	27
31	37
32	47
33	57
34	67
35	77
36	80
37	18
38	28
39	38
40	48
41	58
42	68
43	78
44	88
45	90
46	19
47	29
48	39
49	49
50	59
51	69
52	79
53	89
54	99
55	100
56	112
57	113
58	114
59	115
60	116
61	117
62	118
63	119
64	120
65	123
66	124
67	125
68	126
69	127
70	128
71	129

n	a(n)
0	0
1	10
2	11
3	20
4	12
5	22
6	30
7	13
8	23
9	33
10	40
11	14
12	24
13	34
14	44
15	50
16	15
17	25
18	35
19	45
20	55
21	60
22	16
23	26
24	36
25	46
26	56
27	66
28	70
29	17
30	27
31	37
32	47
33	57
34	67
35	77
36	80
37	18
38	28
39	38
40	48
41	58
42	68
43	78
44	88
45	90
46	19
47	29
48	39
49	49
50	59
51	69
52	79
53	89
54	99
55	100
56	112
57	113
58	114
59	115
60	116
61	117
62	118
63	119
64	120
65	123
66	124
67	125
68	126
69	127
70	128
71	129

n	a(n)
0	0
1	10
2	11
3	20
4	12
5	22
6	30
7	13
8	23
9	33
10	40
11	14
12	24
13	34
14	44
15	50
16	15
17	25
18	35
19	45
20	55
21	60
22	16
23	26
24	36
25	46
26	56
27	66
28	70
29	17
30	27
31	37
32	47
33	57
34	67
35	77
36	80
37	18
38	28
39	38
40	48
41	58
42	68
43	78
44	88
45	90
46	19
47	29
48	39
49	49
50	59
51	69
52	79
53	89
54	99
55	100
56	112
57	113
58	114
59	115
60	116
61	117
62	118
63	119
64	120
65	123
66	124
67	125
68	126
69	127
70	128
71	129