A175498 - cp's OEIS frontend

A175498 a(1)=1. a(n) = the smallest positive integer not occurring earlier such that a(n)-a(n-1) doesn't equal a(k)-a(k-1) for any k with 2 <= k <= n-1.

n	a(n)
1	1
2	2
3	4
4	3
5	6
6	10
7	5
8	11
9	7
10	12
11	9
12	16
13	8
14	17
15	15
16	23
17	13
18	24
19	18
20	28
21	14
22	26
23	19
24	32
25	20
26	34
27	21
28	36
29	25
30	41
31	22
32	39
33	30
34	48
35	27
36	46
37	29
38	49
39	31
40	52
41	37
42	59
43	33
44	56
45	40
46	64
47	35
48	60
49	38
50	65
51	42
52	68
53	43
54	71
55	44
56	73
57	45
58	75
59	51
60	82
61	47
62	79
63	112
64	50
65	84
66	53
67	88
68	54
69	90
70	57
71	94
72	55
73	93
74	61
75	100
76	58
77	98
78	62
79	103
80	63
81	105
82	67

[1, 2, 4, 3, 6, 10, 5, 11, 7, 12, 9, 16, 8, 17, 15, 23, 13, 24, 18, 28, 14, 26, 19, 32, 20, 34, 21, 36, 25, 41, 22, 39, 30, 48, 27, 46, 29, 49, 31, 52, 37, 59, 33, 56, 40, 64, 35, 60, 38, 65, 42, 68, 43, 71, 44, 73, 45, 75, 51, 82, 47, 79, 112, 50, 84, 53, 88, 54, 90, 57, 94, 55, 93, 61, 100, 58, 98, 62, 103, 63, 105, 67]

cp's OEIS Frontend

A175498 a(1)=1. a(n) = the smallest positive integer not occurring earlier such that a(n)-a(n-1) doesn't equal a(k)-a(k-1) for any k with 2 <= k <= n-1.

Table of values

List of values

n	a(n)
1	1
2	2
3	4
4	3
5	6
6	10
7	5
8	11
9	7
10	12
11	9
12	16
13	8
14	17
15	15
16	23
17	13
18	24
19	18
20	28
21	14
22	26
23	19
24	32
25	20
26	34
27	21
28	36
29	25
30	41
31	22
32	39
33	30
34	48
35	27
36	46
37	29
38	49
39	31
40	52
41	37
42	59
43	33
44	56
45	40
46	64
47	35
48	60
49	38
50	65
51	42
52	68
53	43
54	71
55	44
56	73
57	45
58	75
59	51
60	82
61	47
62	79
63	112
64	50
65	84
66	53
67	88
68	54
69	90
70	57
71	94
72	55
73	93
74	61
75	100
76	58
77	98
78	62
79	103
80	63
81	105
82	67

n	a(n)
1	1
2	2
3	4
4	3
5	6
6	10
7	5
8	11
9	7
10	12
11	9
12	16
13	8
14	17
15	15
16	23
17	13
18	24
19	18
20	28
21	14
22	26
23	19
24	32
25	20
26	34
27	21
28	36
29	25
30	41
31	22
32	39
33	30
34	48
35	27
36	46
37	29
38	49
39	31
40	52
41	37
42	59
43	33
44	56
45	40
46	64
47	35
48	60
49	38
50	65
51	42
52	68
53	43
54	71
55	44
56	73
57	45
58	75
59	51
60	82
61	47
62	79
63	112
64	50
65	84
66	53
67	88
68	54
69	90
70	57
71	94
72	55
73	93
74	61
75	100
76	58
77	98
78	62
79	103
80	63
81	105
82	67

n	a(n)
1	1
2	2
3	4
4	3
5	6
6	10
7	5
8	11
9	7
10	12
11	9
12	16
13	8
14	17
15	15
16	23
17	13
18	24
19	18
20	28
21	14
22	26
23	19
24	32
25	20
26	34
27	21
28	36
29	25
30	41
31	22
32	39
33	30
34	48
35	27
36	46
37	29
38	49
39	31
40	52
41	37
42	59
43	33
44	56
45	40
46	64
47	35
48	60
49	38
50	65
51	42
52	68
53	43
54	71
55	44
56	73
57	45
58	75
59	51
60	82
61	47
62	79
63	112
64	50
65	84
66	53
67	88
68	54
69	90
70	57
71	94
72	55
73	93
74	61
75	100
76	58
77	98
78	62
79	103
80	63
81	105
82	67