A246370 - cp's OEIS frontend

A246370 a(1)=0, a(p_n) = 1 + a(n), a(c_n) = a(n), where p_n = n-th prime = A000040(n), c_n = n-th composite number = A002808(n); Also number of nonleading 0-bits in the binary representation of A135141(n).

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

[0, 1, 2, 0, 3, 1, 1, 2, 0, 3, 4, 1, 2, 1, 2, 0, 2, 3, 3, 4, 1, 2, 1, 1, 2, 0, 2, 3, 4, 3, 5, 4, 1, 2, 1, 1, 2, 2, 0, 2, 3, 3, 2, 4, 3, 5, 3, 4, 1, 2, 1, 1, 1, 2, 2, 0, 2, 3, 3, 3, 4, 2, 4, 3, 5, 3, 4, 4, 1, 2, 5, 1, 2, 1, 1, 2, 2, 0, 3, 2, 3, 3, 2, 3, 4, 2, 4, 3, 2, 5, 3, 4, 4, 1, 2, 5, 3, 1, 2, 1, 1, 1, 3, 2, 2, 0, 4, 3, 5, 2, 3, 3, 4, 2, 3, 4, 2, 4, 3, 2]

cp's OEIS Frontend

A246370 a(1)=0, a(p_n) = 1 + a(n), a(c_n) = a(n), where p_n = n-th prime = A000040(n), c_n = n-th composite number = A002808(n); Also number of nonleading 0-bits in the binary representation of A135141(n).

Table of values

List of values

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

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

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