A075522 - cp's OEIS frontend

A075522 Number of steps to reach the first nonprime (=A075523(n)) starting with the n-th prime p and iterating the map k -> 4*k+(p mod 4), or -1 if no integer is ever reached.

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

[1, 1, 1, 3, 3, 2, 1, 2, 1, 1, 2, 2, 1, 1, 2, 1, 2, 1, 3, 1, 2, 1, 1, 1, 2, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 4, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 1, 2, 2, 2, 1, 1, 1, 1, 1, 2, 1, 1, 1, 2, 3, 1, 1, 1, 1, 1, 3, 1, 2, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 4]

cp's OEIS Frontend

A075522 Number of steps to reach the first nonprime (=A075523(n)) starting with the n-th prime p and iterating the map k -> 4*k+(p mod 4), or -1 if no integer is ever reached.

Table of values

List of values

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

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

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