A329818 - cp's OEIS frontend

A329818 Look left and tell the least frequent digit string; a(0) = 0, a(n) = concat(c,s), where c > 0 is the number of times the string s, composed of one or more digits, has appeared in a(0) to a(n-1) such that a(n) is minimal. Digit strings with leading zeros are ignored.

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	111
57	112
58	113
59	114
60	115
61	116
62	117
63	118
64	119
65	120
66	122

[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, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 122]

cp's OEIS Frontend

A329818 Look left and tell the least frequent digit string; a(0) = 0, a(n) = concat(c,s), where c > 0 is the number of times the string s, composed of one or more digits, has appeared in a(0) to a(n-1) such that a(n) is minimal. Digit strings with leading zeros are ignored.

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	111
57	112
58	113
59	114
60	115
61	116
62	117
63	118
64	119
65	120
66	122

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	111
57	112
58	113
59	114
60	115
61	116
62	117
63	118
64	119
65	120
66	122

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	111
57	112
58	113
59	114
60	115
61	116
62	117
63	118
64	119
65	120
66	122