A181391 - cp's OEIS frontend

A181391 Van Eck's sequence: For n >= 1, if there exists an m < n such that a(m) = a(n), take the largest such m and set a(n+1) = n-m; otherwise a(n+1) = 0. Start with a(1)=0.

n	a(n)
1	0
2	0
3	1
4	0
5	2
6	0
7	2
8	2
9	1
10	6
11	0
12	5
13	0
14	2
15	6
16	5
17	4
18	0
19	5
20	3
21	0
22	3
23	2
24	9
25	0
26	4
27	9
28	3
29	6
30	14
31	0
32	6
33	3
34	5
35	15
36	0
37	5
38	3
39	5
40	2
41	17
42	0
43	6
44	11
45	0
46	3
47	8
48	0
49	3
50	3
51	1
52	42
53	0
54	5
55	15
56	20
57	0
58	4
59	32
60	0
61	3
62	11
63	18
64	0
65	4
66	7
67	0
68	3
69	7
70	3
71	2
72	31
73	0
74	6
75	31
76	3
77	6
78	3
79	2
80	8
81	33
82	0
83	9
84	56
85	0
86	3
87	8
88	7
89	19
90	0
91	5
92	37
93	0
94	3
95	8
96	8
97	1

[0, 0, 1, 0, 2, 0, 2, 2, 1, 6, 0, 5, 0, 2, 6, 5, 4, 0, 5, 3, 0, 3, 2, 9, 0, 4, 9, 3, 6, 14, 0, 6, 3, 5, 15, 0, 5, 3, 5, 2, 17, 0, 6, 11, 0, 3, 8, 0, 3, 3, 1, 42, 0, 5, 15, 20, 0, 4, 32, 0, 3, 11, 18, 0, 4, 7, 0, 3, 7, 3, 2, 31, 0, 6, 31, 3, 6, 3, 2, 8, 33, 0, 9, 56, 0, 3, 8, 7, 19, 0, 5, 37, 0, 3, 8, 8, 1]

cp's OEIS Frontend

A181391 Van Eck's sequence: For n >= 1, if there exists an m < n such that a(m) = a(n), take the largest such m and set a(n+1) = n-m; otherwise a(n+1) = 0. Start with a(1)=0.

Table of values

List of values

n	a(n)
1	0
2	0
3	1
4	0
5	2
6	0
7	2
8	2
9	1
10	6
11	0
12	5
13	0
14	2
15	6
16	5
17	4
18	0
19	5
20	3
21	0
22	3
23	2
24	9
25	0
26	4
27	9
28	3
29	6
30	14
31	0
32	6
33	3
34	5
35	15
36	0
37	5
38	3
39	5
40	2
41	17
42	0
43	6
44	11
45	0
46	3
47	8
48	0
49	3
50	3
51	1
52	42
53	0
54	5
55	15
56	20
57	0
58	4
59	32
60	0
61	3
62	11
63	18
64	0
65	4
66	7
67	0
68	3
69	7
70	3
71	2
72	31
73	0
74	6
75	31
76	3
77	6
78	3
79	2
80	8
81	33
82	0
83	9
84	56
85	0
86	3
87	8
88	7
89	19
90	0
91	5
92	37
93	0
94	3
95	8
96	8
97	1

n	a(n)
1	0
2	0
3	1
4	0
5	2
6	0
7	2
8	2
9	1
10	6
11	0
12	5
13	0
14	2
15	6
16	5
17	4
18	0
19	5
20	3
21	0
22	3
23	2
24	9
25	0
26	4
27	9
28	3
29	6
30	14
31	0
32	6
33	3
34	5
35	15
36	0
37	5
38	3
39	5
40	2
41	17
42	0
43	6
44	11
45	0
46	3
47	8
48	0
49	3
50	3
51	1
52	42
53	0
54	5
55	15
56	20
57	0
58	4
59	32
60	0
61	3
62	11
63	18
64	0
65	4
66	7
67	0
68	3
69	7
70	3
71	2
72	31
73	0
74	6
75	31
76	3
77	6
78	3
79	2
80	8
81	33
82	0
83	9
84	56
85	0
86	3
87	8
88	7
89	19
90	0
91	5
92	37
93	0
94	3
95	8
96	8
97	1

n	a(n)
1	0
2	0
3	1
4	0
5	2
6	0
7	2
8	2
9	1
10	6
11	0
12	5
13	0
14	2
15	6
16	5
17	4
18	0
19	5
20	3
21	0
22	3
23	2
24	9
25	0
26	4
27	9
28	3
29	6
30	14
31	0
32	6
33	3
34	5
35	15
36	0
37	5
38	3
39	5
40	2
41	17
42	0
43	6
44	11
45	0
46	3
47	8
48	0
49	3
50	3
51	1
52	42
53	0
54	5
55	15
56	20
57	0
58	4
59	32
60	0
61	3
62	11
63	18
64	0
65	4
66	7
67	0
68	3
69	7
70	3
71	2
72	31
73	0
74	6
75	31
76	3
77	6
78	3
79	2
80	8
81	33
82	0
83	9
84	56
85	0
86	3
87	8
88	7
89	19
90	0
91	5
92	37
93	0
94	3
95	8
96	8
97	1