A247977 - cp's OEIS frontend

A247977 If n = 1 or prime, then a(n) = 0; otherwise, if n is a preprime of k-th kind, then a(n) = k.

n	a(n)
1	0
2	0
3	0
4	1
5	0
6	1
7	0
8	1
9	1
10	2
11	0
12	2
13	0
14	2
15	1
16	2
17	0
18	2
19	0
20	2
21	1
22	2
23	0
24	2
25	1
26	3
27	2
28	3
29	0
30	3
31	0
32	3
33	2
34	3
35	1
36	3
37	0
38	3
39	2
40	3
41	0
42	3
43	0
44	3
45	2
46	3
47	0
48	3
49	1
50	4
51	3
52	4
53	0
54	4
55	2
56	4
57	3
58	4
59	0
60	4
61	0
62	4
63	3
64	4
65	2
66	4
67	0
68	4
69	3
70	4
71	0
72	4
73	0
74	4
75	3
76	4
77	1
78	4
79	0
80	4
81	3
82	4
83	0
84	4
85	2
86	4
87	3
88	4
89	0
90	4
91	1
92	4
93	3
94	4
95	2
96	4
97	0
98	4
99	3
100	4
101	0
102	4
103	0
104	4
105	3
106	4
107	0
108	4
109	0
110	4
111	3
112	4
113	0
114	4
115	2
116	4
117	3
118	4
119	1
120	4
121	1
122	5
123	4
124	5
125	3

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

cp's OEIS Frontend

A247977 If n = 1 or prime, then a(n) = 0; otherwise, if n is a preprime of k-th kind, then a(n) = k.

Table of values

List of values

n	a(n)
1	0
2	0
3	0
4	1
5	0
6	1
7	0
8	1
9	1
10	2
11	0
12	2
13	0
14	2
15	1
16	2
17	0
18	2
19	0
20	2
21	1
22	2
23	0
24	2
25	1
26	3
27	2
28	3
29	0
30	3
31	0
32	3
33	2
34	3
35	1
36	3
37	0
38	3
39	2
40	3
41	0
42	3
43	0
44	3
45	2
46	3
47	0
48	3
49	1
50	4
51	3
52	4
53	0
54	4
55	2
56	4
57	3
58	4
59	0
60	4
61	0
62	4
63	3
64	4
65	2
66	4
67	0
68	4
69	3
70	4
71	0
72	4
73	0
74	4
75	3
76	4
77	1
78	4
79	0
80	4
81	3
82	4
83	0
84	4
85	2
86	4
87	3
88	4
89	0
90	4
91	1
92	4
93	3
94	4
95	2
96	4
97	0
98	4
99	3
100	4
101	0
102	4
103	0
104	4
105	3
106	4
107	0
108	4
109	0
110	4
111	3
112	4
113	0
114	4
115	2
116	4
117	3
118	4
119	1
120	4
121	1
122	5
123	4
124	5
125	3

n	a(n)
1	0
2	0
3	0
4	1
5	0
6	1
7	0
8	1
9	1
10	2
11	0
12	2
13	0
14	2
15	1
16	2
17	0
18	2
19	0
20	2
21	1
22	2
23	0
24	2
25	1
26	3
27	2
28	3
29	0
30	3
31	0
32	3
33	2
34	3
35	1
36	3
37	0
38	3
39	2
40	3
41	0
42	3
43	0
44	3
45	2
46	3
47	0
48	3
49	1
50	4
51	3
52	4
53	0
54	4
55	2
56	4
57	3
58	4
59	0
60	4
61	0
62	4
63	3
64	4
65	2
66	4
67	0
68	4
69	3
70	4
71	0
72	4
73	0
74	4
75	3
76	4
77	1
78	4
79	0
80	4
81	3
82	4
83	0
84	4
85	2
86	4
87	3
88	4
89	0
90	4
91	1
92	4
93	3
94	4
95	2
96	4
97	0
98	4
99	3
100	4
101	0
102	4
103	0
104	4
105	3
106	4
107	0
108	4
109	0
110	4
111	3
112	4
113	0
114	4
115	2
116	4
117	3
118	4
119	1
120	4
121	1
122	5
123	4
124	5
125	3

n	a(n)
1	0
2	0
3	0
4	1
5	0
6	1
7	0
8	1
9	1
10	2
11	0
12	2
13	0
14	2
15	1
16	2
17	0
18	2
19	0
20	2
21	1
22	2
23	0
24	2
25	1
26	3
27	2
28	3
29	0
30	3
31	0
32	3
33	2
34	3
35	1
36	3
37	0
38	3
39	2
40	3
41	0
42	3
43	0
44	3
45	2
46	3
47	0
48	3
49	1
50	4
51	3
52	4
53	0
54	4
55	2
56	4
57	3
58	4
59	0
60	4
61	0
62	4
63	3
64	4
65	2
66	4
67	0
68	4
69	3
70	4
71	0
72	4
73	0
74	4
75	3
76	4
77	1
78	4
79	0
80	4
81	3
82	4
83	0
84	4
85	2
86	4
87	3
88	4
89	0
90	4
91	1
92	4
93	3
94	4
95	2
96	4
97	0
98	4
99	3
100	4
101	0
102	4
103	0
104	4
105	3
106	4
107	0
108	4
109	0
110	4
111	3
112	4
113	0
114	4
115	2
116	4
117	3
118	4
119	1
120	4
121	1
122	5
123	4
124	5
125	3