A080189 - cp's OEIS frontend

A080189 a(n) = k such that f^k(prime(n)) = 2, where f is the mapping of primes > 2 to primes defined by A052248.

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

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

cp's OEIS Frontend

A080189 a(n) = k such that f^k(prime(n)) = 2, where f is the mapping of primes > 2 to primes defined by A052248.

Table of values

List of values

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

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

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