A336891 - cp's OEIS frontend

A336891 Sequence following Van Eck's sequence unless a prime which was previously encountered is found, in which case, a(n+1) = n - m, where m is the largest possible value such that a(m) is also prime.

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	2
16	1
17	7
18	0
19	5
20	2
21	1
22	5
23	2
24	1
25	3
26	0
27	8
28	0
29	2
30	4
31	0
32	3
33	3
34	1
35	10
36	0
37	5
38	4
39	8
40	12
41	0
42	5
43	5
44	1
45	10
46	10
47	1
48	3
49	5
50	1
51	3
52	2
53	1
54	3
55	2
56	1
57	3
58	2
59	1
60	3
61	2
62	1
63	3
64	2
65	1
66	3
67	2
68	1
69	3
70	2
71	1
72	3
73	2
74	1
75	3
76	2
77	1
78	3
79	2
80	1
81	3
82	2
83	1
84	3
85	2
86	1

[0, 0, 1, 0, 2, 0, 2, 2, 1, 6, 0, 5, 0, 2, 2, 1, 7, 0, 5, 2, 1, 5, 2, 1, 3, 0, 8, 0, 2, 4, 0, 3, 3, 1, 10, 0, 5, 4, 8, 12, 0, 5, 5, 1, 10, 10, 1, 3, 5, 1, 3, 2, 1, 3, 2, 1, 3, 2, 1, 3, 2, 1, 3, 2, 1, 3, 2, 1, 3, 2, 1, 3, 2, 1, 3, 2, 1, 3, 2, 1, 3, 2, 1, 3, 2, 1]

cp's OEIS Frontend

A336891 Sequence following Van Eck's sequence unless a prime which was previously encountered is found, in which case, a(n+1) = n - m, where m is the largest possible value such that a(m) is also prime.

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	2
16	1
17	7
18	0
19	5
20	2
21	1
22	5
23	2
24	1
25	3
26	0
27	8
28	0
29	2
30	4
31	0
32	3
33	3
34	1
35	10
36	0
37	5
38	4
39	8
40	12
41	0
42	5
43	5
44	1
45	10
46	10
47	1
48	3
49	5
50	1
51	3
52	2
53	1
54	3
55	2
56	1
57	3
58	2
59	1
60	3
61	2
62	1
63	3
64	2
65	1
66	3
67	2
68	1
69	3
70	2
71	1
72	3
73	2
74	1
75	3
76	2
77	1
78	3
79	2
80	1
81	3
82	2
83	1
84	3
85	2
86	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	2
16	1
17	7
18	0
19	5
20	2
21	1
22	5
23	2
24	1
25	3
26	0
27	8
28	0
29	2
30	4
31	0
32	3
33	3
34	1
35	10
36	0
37	5
38	4
39	8
40	12
41	0
42	5
43	5
44	1
45	10
46	10
47	1
48	3
49	5
50	1
51	3
52	2
53	1
54	3
55	2
56	1
57	3
58	2
59	1
60	3
61	2
62	1
63	3
64	2
65	1
66	3
67	2
68	1
69	3
70	2
71	1
72	3
73	2
74	1
75	3
76	2
77	1
78	3
79	2
80	1
81	3
82	2
83	1
84	3
85	2
86	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	2
16	1
17	7
18	0
19	5
20	2
21	1
22	5
23	2
24	1
25	3
26	0
27	8
28	0
29	2
30	4
31	0
32	3
33	3
34	1
35	10
36	0
37	5
38	4
39	8
40	12
41	0
42	5
43	5
44	1
45	10
46	10
47	1
48	3
49	5
50	1
51	3
52	2
53	1
54	3
55	2
56	1
57	3
58	2
59	1
60	3
61	2
62	1
63	3
64	2
65	1
66	3
67	2
68	1
69	3
70	2
71	1
72	3
73	2
74	1
75	3
76	2
77	1
78	3
79	2
80	1
81	3
82	2
83	1
84	3
85	2
86	1