A277487 - cp's OEIS frontend

A277487 a(n) = number of primes encountered before reaching (n^2)-1 when starting from k = ((n+1)^2)-1 and iterating map k -> k - A002828(k).

n	a(n)
1	1
2	0
3	1
4	0
5	0
6	1
7	2
8	1
9	1
10	0
11	2
12	1
13	2
14	0
15	3
16	2
17	0
18	3
19	0
20	2
21	0
22	1
23	4
24	2
25	3
26	2
27	4
28	2
29	0
30	3
31	3
32	2
33	5
34	3
35	4
36	3
37	3
38	3
39	2
40	4
41	2
42	2
43	4
44	3
45	3
46	3
47	6
48	3
49	1
50	3
51	4
52	2
53	6
54	3
55	3
56	2
57	5
58	5
59	5
60	5
61	4
62	3
63	7
64	4
65	4
66	6
67	4
68	2
69	4
70	6
71	5
72	5
73	5
74	4
75	7
76	4
77	4
78	7
79	4
80	0
81	5
82	6
83	7
84	4
85	4
86	9
87	4
88	5
89	2
90	6
91	6
92	7
93	11
94	3
95	6
96	4
97	9
98	5
99	7
100	7
101	7
102	6
103	8
104	8
105	7
106	6
107	4
108	6
109	5
110	7
111	8
112	5
113	9
114	8
115	8
116	5
117	12
118	7
119	5
120	6

[1, 0, 1, 0, 0, 1, 2, 1, 1, 0, 2, 1, 2, 0, 3, 2, 0, 3, 0, 2, 0, 1, 4, 2, 3, 2, 4, 2, 0, 3, 3, 2, 5, 3, 4, 3, 3, 3, 2, 4, 2, 2, 4, 3, 3, 3, 6, 3, 1, 3, 4, 2, 6, 3, 3, 2, 5, 5, 5, 5, 4, 3, 7, 4, 4, 6, 4, 2, 4, 6, 5, 5, 5, 4, 7, 4, 4, 7, 4, 0, 5, 6, 7, 4, 4, 9, 4, 5, 2, 6, 6, 7, 11, 3, 6, 4, 9, 5, 7, 7, 7, 6, 8, 8, 7, 6, 4, 6, 5, 7, 8, 5, 9, 8, 8, 5, 12, 7, 5, 6]

cp's OEIS Frontend

A277487 a(n) = number of primes encountered before reaching (n^2)-1 when starting from k = ((n+1)^2)-1 and iterating map k -> k - A002828(k).

Table of values

List of values

n	a(n)
1	1
2	0
3	1
4	0
5	0
6	1
7	2
8	1
9	1
10	0
11	2
12	1
13	2
14	0
15	3
16	2
17	0
18	3
19	0
20	2
21	0
22	1
23	4
24	2
25	3
26	2
27	4
28	2
29	0
30	3
31	3
32	2
33	5
34	3
35	4
36	3
37	3
38	3
39	2
40	4
41	2
42	2
43	4
44	3
45	3
46	3
47	6
48	3
49	1
50	3
51	4
52	2
53	6
54	3
55	3
56	2
57	5
58	5
59	5
60	5
61	4
62	3
63	7
64	4
65	4
66	6
67	4
68	2
69	4
70	6
71	5
72	5
73	5
74	4
75	7
76	4
77	4
78	7
79	4
80	0
81	5
82	6
83	7
84	4
85	4
86	9
87	4
88	5
89	2
90	6
91	6
92	7
93	11
94	3
95	6
96	4
97	9
98	5
99	7
100	7
101	7
102	6
103	8
104	8
105	7
106	6
107	4
108	6
109	5
110	7
111	8
112	5
113	9
114	8
115	8
116	5
117	12
118	7
119	5
120	6

n	a(n)
1	1
2	0
3	1
4	0
5	0
6	1
7	2
8	1
9	1
10	0
11	2
12	1
13	2
14	0
15	3
16	2
17	0
18	3
19	0
20	2
21	0
22	1
23	4
24	2
25	3
26	2
27	4
28	2
29	0
30	3
31	3
32	2
33	5
34	3
35	4
36	3
37	3
38	3
39	2
40	4
41	2
42	2
43	4
44	3
45	3
46	3
47	6
48	3
49	1
50	3
51	4
52	2
53	6
54	3
55	3
56	2
57	5
58	5
59	5
60	5
61	4
62	3
63	7
64	4
65	4
66	6
67	4
68	2
69	4
70	6
71	5
72	5
73	5
74	4
75	7
76	4
77	4
78	7
79	4
80	0
81	5
82	6
83	7
84	4
85	4
86	9
87	4
88	5
89	2
90	6
91	6
92	7
93	11
94	3
95	6
96	4
97	9
98	5
99	7
100	7
101	7
102	6
103	8
104	8
105	7
106	6
107	4
108	6
109	5
110	7
111	8
112	5
113	9
114	8
115	8
116	5
117	12
118	7
119	5
120	6

n	a(n)
1	1
2	0
3	1
4	0
5	0
6	1
7	2
8	1
9	1
10	0
11	2
12	1
13	2
14	0
15	3
16	2
17	0
18	3
19	0
20	2
21	0
22	1
23	4
24	2
25	3
26	2
27	4
28	2
29	0
30	3
31	3
32	2
33	5
34	3
35	4
36	3
37	3
38	3
39	2
40	4
41	2
42	2
43	4
44	3
45	3
46	3
47	6
48	3
49	1
50	3
51	4
52	2
53	6
54	3
55	3
56	2
57	5
58	5
59	5
60	5
61	4
62	3
63	7
64	4
65	4
66	6
67	4
68	2
69	4
70	6
71	5
72	5
73	5
74	4
75	7
76	4
77	4
78	7
79	4
80	0
81	5
82	6
83	7
84	4
85	4
86	9
87	4
88	5
89	2
90	6
91	6
92	7
93	11
94	3
95	6
96	4
97	9
98	5
99	7
100	7
101	7
102	6
103	8
104	8
105	7
106	6
107	4
108	6
109	5
110	7
111	8
112	5
113	9
114	8
115	8
116	5
117	12
118	7
119	5
120	6