A309540 - cp's OEIS frontend

A309540 a(n) is the smallest positive number not yet in the sequence that contains exactly one even digit and exactly one odd digit from a(n-1), and no digit in a(n) is repeated.

n	a(n)
1	10
2	102
3	12
4	21
5	120
6	103
7	30
8	130
9	104
10	14
11	41
12	124
13	123
14	23
15	32
16	132
17	125
18	25
19	52
20	152
21	126
22	16
23	61
24	106
25	105
26	50
27	150
28	107
29	70
30	170
31	108
32	18
33	81
34	128
35	127
36	27
37	72
38	172
39	129
40	29
41	92
42	192
43	142
44	134
45	34
46	43
47	143
48	140
49	109
50	90
51	190
52	160
53	136
54	36
55	63
56	163

[10, 102, 12, 21, 120, 103, 30, 130, 104, 14, 41, 124, 123, 23, 32, 132, 125, 25, 52, 152, 126, 16, 61, 106, 105, 50, 150, 107, 70, 170, 108, 18, 81, 128, 127, 27, 72, 172, 129, 29, 92, 192, 142, 134, 34, 43, 143, 140, 109, 90, 190, 160, 136, 36, 63, 163]

cp's OEIS Frontend

A309540 a(n) is the smallest positive number not yet in the sequence that contains exactly one even digit and exactly one odd digit from a(n-1), and no digit in a(n) is repeated.

Table of values

List of values

n	a(n)
1	10
2	102
3	12
4	21
5	120
6	103
7	30
8	130
9	104
10	14
11	41
12	124
13	123
14	23
15	32
16	132
17	125
18	25
19	52
20	152
21	126
22	16
23	61
24	106
25	105
26	50
27	150
28	107
29	70
30	170
31	108
32	18
33	81
34	128
35	127
36	27
37	72
38	172
39	129
40	29
41	92
42	192
43	142
44	134
45	34
46	43
47	143
48	140
49	109
50	90
51	190
52	160
53	136
54	36
55	63
56	163

n	a(n)
1	10
2	102
3	12
4	21
5	120
6	103
7	30
8	130
9	104
10	14
11	41
12	124
13	123
14	23
15	32
16	132
17	125
18	25
19	52
20	152
21	126
22	16
23	61
24	106
25	105
26	50
27	150
28	107
29	70
30	170
31	108
32	18
33	81
34	128
35	127
36	27
37	72
38	172
39	129
40	29
41	92
42	192
43	142
44	134
45	34
46	43
47	143
48	140
49	109
50	90
51	190
52	160
53	136
54	36
55	63
56	163

n	a(n)
1	10
2	102
3	12
4	21
5	120
6	103
7	30
8	130
9	104
10	14
11	41
12	124
13	123
14	23
15	32
16	132
17	125
18	25
19	52
20	152
21	126
22	16
23	61
24	106
25	105
26	50
27	150
28	107
29	70
30	170
31	108
32	18
33	81
34	128
35	127
36	27
37	72
38	172
39	129
40	29
41	92
42	192
43	142
44	134
45	34
46	43
47	143
48	140
49	109
50	90
51	190
52	160
53	136
54	36
55	63
56	163