A140778 - cp's OEIS frontend

A140778 a(n) is the smallest positive integer such that no number occurs twice in the union of the sequence and its absolute first differences.

n	a(n)
1	1
2	3
3	7
4	12
5	18
6	8
7	17
8	28
9	13
10	27
11	43
12	19
13	39
14	60
15	22
16	45
17	70
18	26
19	55
20	85
21	31
22	63
23	96
24	34
25	69
26	105
27	37
28	77
29	118
30	42
31	88
32	135
33	48
34	97
35	147
36	52
37	103
38	156
39	56
40	113
41	171
42	59
43	120
44	184
45	65
46	131
47	198
48	71
49	143
50	216
51	74
52	149
53	227
54	79
55	159
56	240
57	82
58	165
59	249
60	86
61	175
62	265
63	91
64	183

[1, 3, 7, 12, 18, 8, 17, 28, 13, 27, 43, 19, 39, 60, 22, 45, 70, 26, 55, 85, 31, 63, 96, 34, 69, 105, 37, 77, 118, 42, 88, 135, 48, 97, 147, 52, 103, 156, 56, 113, 171, 59, 120, 184, 65, 131, 198, 71, 143, 216, 74, 149, 227, 79, 159, 240, 82, 165, 249, 86, 175, 265, 91, 183]

cp's OEIS Frontend

A140778 a(n) is the smallest positive integer such that no number occurs twice in the union of the sequence and its absolute first differences.

Table of values

List of values

n	a(n)
1	1
2	3
3	7
4	12
5	18
6	8
7	17
8	28
9	13
10	27
11	43
12	19
13	39
14	60
15	22
16	45
17	70
18	26
19	55
20	85
21	31
22	63
23	96
24	34
25	69
26	105
27	37
28	77
29	118
30	42
31	88
32	135
33	48
34	97
35	147
36	52
37	103
38	156
39	56
40	113
41	171
42	59
43	120
44	184
45	65
46	131
47	198
48	71
49	143
50	216
51	74
52	149
53	227
54	79
55	159
56	240
57	82
58	165
59	249
60	86
61	175
62	265
63	91
64	183

n	a(n)
1	1
2	3
3	7
4	12
5	18
6	8
7	17
8	28
9	13
10	27
11	43
12	19
13	39
14	60
15	22
16	45
17	70
18	26
19	55
20	85
21	31
22	63
23	96
24	34
25	69
26	105
27	37
28	77
29	118
30	42
31	88
32	135
33	48
34	97
35	147
36	52
37	103
38	156
39	56
40	113
41	171
42	59
43	120
44	184
45	65
46	131
47	198
48	71
49	143
50	216
51	74
52	149
53	227
54	79
55	159
56	240
57	82
58	165
59	249
60	86
61	175
62	265
63	91
64	183

n	a(n)
1	1
2	3
3	7
4	12
5	18
6	8
7	17
8	28
9	13
10	27
11	43
12	19
13	39
14	60
15	22
16	45
17	70
18	26
19	55
20	85
21	31
22	63
23	96
24	34
25	69
26	105
27	37
28	77
29	118
30	42
31	88
32	135
33	48
34	97
35	147
36	52
37	103
38	156
39	56
40	113
41	171
42	59
43	120
44	184
45	65
46	131
47	198
48	71
49	143
50	216
51	74
52	149
53	227
54	79
55	159
56	240
57	82
58	165
59	249
60	86
61	175
62	265
63	91
64	183