A357377 - cp's OEIS frontend

A357377 a(0) = 0; for n > 0, a(n) is the smallest positive number not occurring earlier such that |a(n) - a(n-1)| does not appear in the string concatenation of a(0)..a(n-1).

n	a(n)
0	0
1	1
2	3
3	5
4	7
5	9
6	11
7	13
8	15
9	17
10	19
11	21
12	25
13	2
14	6
15	10
16	14
17	22
18	4
19	12
20	20
21	28
22	44
23	8
24	24
25	40
26	56
27	18
28	34
29	50
30	23
31	39
32	55
33	26
34	42
35	58
36	29
37	45
38	61
39	31
40	47
41	63
42	27
43	43
44	59
45	75
46	37
47	53
48	69
49	85
50	36
51	52
52	68
53	30
54	46
55	62
56	78
57	94
58	110
59	33
60	49
61	65
62	81
63	97
64	113
65	41
66	57
67	73
68	35
69	51
70	67
71	105
72	143
73	16
74	54

[0, 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 25, 2, 6, 10, 14, 22, 4, 12, 20, 28, 44, 8, 24, 40, 56, 18, 34, 50, 23, 39, 55, 26, 42, 58, 29, 45, 61, 31, 47, 63, 27, 43, 59, 75, 37, 53, 69, 85, 36, 52, 68, 30, 46, 62, 78, 94, 110, 33, 49, 65, 81, 97, 113, 41, 57, 73, 35, 51, 67, 105, 143, 16, 54]

cp's OEIS Frontend

A357377 a(0) = 0; for n > 0, a(n) is the smallest positive number not occurring earlier such that |a(n) - a(n-1)| does not appear in the string concatenation of a(0)..a(n-1).

Table of values

List of values

n	a(n)
0	0
1	1
2	3
3	5
4	7
5	9
6	11
7	13
8	15
9	17
10	19
11	21
12	25
13	2
14	6
15	10
16	14
17	22
18	4
19	12
20	20
21	28
22	44
23	8
24	24
25	40
26	56
27	18
28	34
29	50
30	23
31	39
32	55
33	26
34	42
35	58
36	29
37	45
38	61
39	31
40	47
41	63
42	27
43	43
44	59
45	75
46	37
47	53
48	69
49	85
50	36
51	52
52	68
53	30
54	46
55	62
56	78
57	94
58	110
59	33
60	49
61	65
62	81
63	97
64	113
65	41
66	57
67	73
68	35
69	51
70	67
71	105
72	143
73	16
74	54

n	a(n)
0	0
1	1
2	3
3	5
4	7
5	9
6	11
7	13
8	15
9	17
10	19
11	21
12	25
13	2
14	6
15	10
16	14
17	22
18	4
19	12
20	20
21	28
22	44
23	8
24	24
25	40
26	56
27	18
28	34
29	50
30	23
31	39
32	55
33	26
34	42
35	58
36	29
37	45
38	61
39	31
40	47
41	63
42	27
43	43
44	59
45	75
46	37
47	53
48	69
49	85
50	36
51	52
52	68
53	30
54	46
55	62
56	78
57	94
58	110
59	33
60	49
61	65
62	81
63	97
64	113
65	41
66	57
67	73
68	35
69	51
70	67
71	105
72	143
73	16
74	54

n	a(n)
0	0
1	1
2	3
3	5
4	7
5	9
6	11
7	13
8	15
9	17
10	19
11	21
12	25
13	2
14	6
15	10
16	14
17	22
18	4
19	12
20	20
21	28
22	44
23	8
24	24
25	40
26	56
27	18
28	34
29	50
30	23
31	39
32	55
33	26
34	42
35	58
36	29
37	45
38	61
39	31
40	47
41	63
42	27
43	43
44	59
45	75
46	37
47	53
48	69
49	85
50	36
51	52
52	68
53	30
54	46
55	62
56	78
57	94
58	110
59	33
60	49
61	65
62	81
63	97
64	113
65	41
66	57
67	73
68	35
69	51
70	67
71	105
72	143
73	16
74	54