A351997 - cp's OEIS frontend

A351997 A chain reaction sequence: a digit d1 from a(n) is expelled towards a(n+1) where it hits a digit d2 [from a(n+1)] and replaces it; d2 in turn is expelled towards a(n+2), hits a digit d3 there and replaces it; d3 in turn is expelled towards a(n+3), hits a digit there, and replaces it; d4 is expelled... etc. At the end of the chain reaction, only odd numbers will be left. This is the lexicographically earliest sequence of distinct positive integers with this property.

n	a(n)
1	1
2	2
3	11
4	3
5	4
6	13
7	5
8	6
9	15
10	7
11	8
12	17
13	9
14	10
15	101
16	103
17	105
18	107
19	109
20	111
21	12
22	19
23	14
24	21
25	23
26	25
27	27
28	29
29	31
30	16
31	33
32	18
33	35
34	20
35	113
36	22
37	37
38	24
39	39
40	26
41	41
42	43
43	45
44	47
45	49
46	51
47	28
48	53
49	30
50	115
51	32
52	55
53	34
54	57
55	36
56	59
57	38
58	61
59	63
60	65
61	67
62	69
63	71
64	40
65	117
66	42
67	73
68	44
69	75
70	46
71	77
72	48
73	79
74	50
75	119
76	52
77	81

[1, 2, 11, 3, 4, 13, 5, 6, 15, 7, 8, 17, 9, 10, 101, 103, 105, 107, 109, 111, 12, 19, 14, 21, 23, 25, 27, 29, 31, 16, 33, 18, 35, 20, 113, 22, 37, 24, 39, 26, 41, 43, 45, 47, 49, 51, 28, 53, 30, 115, 32, 55, 34, 57, 36, 59, 38, 61, 63, 65, 67, 69, 71, 40, 117, 42, 73, 44, 75, 46, 77, 48, 79, 50, 119, 52, 81]

cp's OEIS Frontend

Table of values

List of values

n	a(n)
1	1
2	2
3	11
4	3
5	4
6	13
7	5
8	6
9	15
10	7
11	8
12	17
13	9
14	10
15	101
16	103
17	105
18	107
19	109
20	111
21	12
22	19
23	14
24	21
25	23
26	25
27	27
28	29
29	31
30	16
31	33
32	18
33	35
34	20
35	113
36	22
37	37
38	24
39	39
40	26
41	41
42	43
43	45
44	47
45	49
46	51
47	28
48	53
49	30
50	115
51	32
52	55
53	34
54	57
55	36
56	59
57	38
58	61
59	63
60	65
61	67
62	69
63	71
64	40
65	117
66	42
67	73
68	44
69	75
70	46
71	77
72	48
73	79
74	50
75	119
76	52
77	81

n	a(n)
1	1
2	2
3	11
4	3
5	4
6	13
7	5
8	6
9	15
10	7
11	8
12	17
13	9
14	10
15	101
16	103
17	105
18	107
19	109
20	111
21	12
22	19
23	14
24	21
25	23
26	25
27	27
28	29
29	31
30	16
31	33
32	18
33	35
34	20
35	113
36	22
37	37
38	24
39	39
40	26
41	41
42	43
43	45
44	47
45	49
46	51
47	28
48	53
49	30
50	115
51	32
52	55
53	34
54	57
55	36
56	59
57	38
58	61
59	63
60	65
61	67
62	69
63	71
64	40
65	117
66	42
67	73
68	44
69	75
70	46
71	77
72	48
73	79
74	50
75	119
76	52
77	81

n	a(n)
1	1
2	2
3	11
4	3
5	4
6	13
7	5
8	6
9	15
10	7
11	8
12	17
13	9
14	10
15	101
16	103
17	105
18	107
19	109
20	111
21	12
22	19
23	14
24	21
25	23
26	25
27	27
28	29
29	31
30	16
31	33
32	18
33	35
34	20
35	113
36	22
37	37
38	24
39	39
40	26
41	41
42	43
43	45
44	47
45	49
46	51
47	28
48	53
49	30
50	115
51	32
52	55
53	34
54	57
55	36
56	59
57	38
58	61
59	63
60	65
61	67
62	69
63	71
64	40
65	117
66	42
67	73
68	44
69	75
70	46
71	77
72	48
73	79
74	50
75	119
76	52
77	81