A352000 - cp's OEIS frontend

A352000 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 square 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	15
4	3
5	16
6	4
7	5
8	20
9	100
10	101
11	6
12	10
13	102
14	25
15	35
16	26
17	45
18	7
19	129
20	8
21	11
22	9
23	40
24	103
25	36
26	46
27	19
28	56
29	21
30	66
31	12
32	55
33	22
34	65
35	13
36	76
37	184
38	80
39	104
40	29
41	75
42	229
43	85
44	31
45	86
46	41
47	39
48	96
49	42
50	95
51	43
52	124
53	81
54	82
55	111
56	83
57	161
58	84
59	49
60	59
61	23
62	224
63	121
64	125
65	87
66	284
67	131
68	261
69	141
70	60
71	105
72	24
73	61
74	88

[1, 2, 15, 3, 16, 4, 5, 20, 100, 101, 6, 10, 102, 25, 35, 26, 45, 7, 129, 8, 11, 9, 40, 103, 36, 46, 19, 56, 21, 66, 12, 55, 22, 65, 13, 76, 184, 80, 104, 29, 75, 229, 85, 31, 86, 41, 39, 96, 42, 95, 43, 124, 81, 82, 111, 83, 161, 84, 49, 59, 23, 224, 121, 125, 87, 284, 131, 261, 141, 60, 105, 24, 61, 88]

cp's OEIS Frontend

Table of values

List of values

n	a(n)
1	1
2	2
3	15
4	3
5	16
6	4
7	5
8	20
9	100
10	101
11	6
12	10
13	102
14	25
15	35
16	26
17	45
18	7
19	129
20	8
21	11
22	9
23	40
24	103
25	36
26	46
27	19
28	56
29	21
30	66
31	12
32	55
33	22
34	65
35	13
36	76
37	184
38	80
39	104
40	29
41	75
42	229
43	85
44	31
45	86
46	41
47	39
48	96
49	42
50	95
51	43
52	124
53	81
54	82
55	111
56	83
57	161
58	84
59	49
60	59
61	23
62	224
63	121
64	125
65	87
66	284
67	131
68	261
69	141
70	60
71	105
72	24
73	61
74	88

n	a(n)
1	1
2	2
3	15
4	3
5	16
6	4
7	5
8	20
9	100
10	101
11	6
12	10
13	102
14	25
15	35
16	26
17	45
18	7
19	129
20	8
21	11
22	9
23	40
24	103
25	36
26	46
27	19
28	56
29	21
30	66
31	12
32	55
33	22
34	65
35	13
36	76
37	184
38	80
39	104
40	29
41	75
42	229
43	85
44	31
45	86
46	41
47	39
48	96
49	42
50	95
51	43
52	124
53	81
54	82
55	111
56	83
57	161
58	84
59	49
60	59
61	23
62	224
63	121
64	125
65	87
66	284
67	131
68	261
69	141
70	60
71	105
72	24
73	61
74	88

n	a(n)
1	1
2	2
3	15
4	3
5	16
6	4
7	5
8	20
9	100
10	101
11	6
12	10
13	102
14	25
15	35
16	26
17	45
18	7
19	129
20	8
21	11
22	9
23	40
24	103
25	36
26	46
27	19
28	56
29	21
30	66
31	12
32	55
33	22
34	65
35	13
36	76
37	184
38	80
39	104
40	29
41	75
42	229
43	85
44	31
45	86
46	41
47	39
48	96
49	42
50	95
51	43
52	124
53	81
54	82
55	111
56	83
57	161
58	84
59	49
60	59
61	23
62	224
63	121
64	125
65	87
66	284
67	131
68	261
69	141
70	60
71	105
72	24
73	61
74	88