A180026 - cp's OEIS frontend

A180026 a(n) is the number of arrangements of all divisors of n of the form d_1=n, d_2, d_3, ..., d_tau(n) such that every ratio d_(i+1)/d_i and d_tau(n)/d_1 is prime or 1/prime.

n	a(n)
1	0
2	1
3	1
4	0
5	1
6	2
7	1
8	0
9	0
10	2
11	1
12	2
13	1
14	2
15	2
16	0
17	1
18	2
19	1
20	2
21	2
22	2
23	1
24	2
25	0
26	2
27	0
28	2
29	1
30	12
31	1
32	0
33	2
34	2
35	2
36	0
37	1
38	2
39	2
40	2
41	1
42	12
43	1
44	2
45	2
46	2
47	1
48	2
49	0
50	2
51	2
52	2
53	1
54	2
55	2
56	2
57	2
58	2
59	1
60	44
61	1
62	2
63	2
64	0
65	2
66	12
67	1
68	2
69	2
70	12
71	1
72	4
73	1
74	2
75	2
76	2
77	2
78	12
79	1
80	2
81	0
82	2
83	1
84	44
85	2
86	2
87	2
88	2
89	1
90	44
91	2
92	2
93	2
94	2
95	2
96	2
97	1
98	2
99	2
100	0
101	1
102	12
103	1
104	2
105	12
106	2
107	1
108	4
109	1
110	12
111	2
112	2
113	1
114	12
115	2
116	2
117	2
118	2
119	2
120	164
121	0
122	2
123	2
124	2
125	0
126	44
127	1
128	0

[0, 1, 1, 0, 1, 2, 1, 0, 0, 2, 1, 2, 1, 2, 2, 0, 1, 2, 1, 2, 2, 2, 1, 2, 0, 2, 0, 2, 1, 12, 1, 0, 2, 2, 2, 0, 1, 2, 2, 2, 1, 12, 1, 2, 2, 2, 1, 2, 0, 2, 2, 2, 1, 2, 2, 2, 2, 2, 1, 44, 1, 2, 2, 0, 2, 12, 1, 2, 2, 12, 1, 4, 1, 2, 2, 2, 2, 12, 1, 2, 0, 2, 1, 44, 2, 2, 2, 2, 1, 44, 2, 2, 2, 2, 2, 2, 1, 2, 2, 0, 1, 12, 1, 2, 12, 2, 1, 4, 1, 12, 2, 2, 1, 12, 2, 2, 2, 2, 2, 164, 0, 2, 2, 2, 0, 44, 1, 0]

cp's OEIS Frontend

A180026 a(n) is the number of arrangements of all divisors of n of the form d_1=n, d_2, d_3, ..., d_tau(n) such that every ratio d_(i+1)/d_i and d_tau(n)/d_1 is prime or 1/prime.

Table of values

List of values

n	a(n)
1	0
2	1
3	1
4	0
5	1
6	2
7	1
8	0
9	0
10	2
11	1
12	2
13	1
14	2
15	2
16	0
17	1
18	2
19	1
20	2
21	2
22	2
23	1
24	2
25	0
26	2
27	0
28	2
29	1
30	12
31	1
32	0
33	2
34	2
35	2
36	0
37	1
38	2
39	2
40	2
41	1
42	12
43	1
44	2
45	2
46	2
47	1
48	2
49	0
50	2
51	2
52	2
53	1
54	2
55	2
56	2
57	2
58	2
59	1
60	44
61	1
62	2
63	2
64	0
65	2
66	12
67	1
68	2
69	2
70	12
71	1
72	4
73	1
74	2
75	2
76	2
77	2
78	12
79	1
80	2
81	0
82	2
83	1
84	44
85	2
86	2
87	2
88	2
89	1
90	44
91	2
92	2
93	2
94	2
95	2
96	2
97	1
98	2
99	2
100	0
101	1
102	12
103	1
104	2
105	12
106	2
107	1
108	4
109	1
110	12
111	2
112	2
113	1
114	12
115	2
116	2
117	2
118	2
119	2
120	164
121	0
122	2
123	2
124	2
125	0
126	44
127	1
128	0

n	a(n)
1	0
2	1
3	1
4	0
5	1
6	2
7	1
8	0
9	0
10	2
11	1
12	2
13	1
14	2
15	2
16	0
17	1
18	2
19	1
20	2
21	2
22	2
23	1
24	2
25	0
26	2
27	0
28	2
29	1
30	12
31	1
32	0
33	2
34	2
35	2
36	0
37	1
38	2
39	2
40	2
41	1
42	12
43	1
44	2
45	2
46	2
47	1
48	2
49	0
50	2
51	2
52	2
53	1
54	2
55	2
56	2
57	2
58	2
59	1
60	44
61	1
62	2
63	2
64	0
65	2
66	12
67	1
68	2
69	2
70	12
71	1
72	4
73	1
74	2
75	2
76	2
77	2
78	12
79	1
80	2
81	0
82	2
83	1
84	44
85	2
86	2
87	2
88	2
89	1
90	44
91	2
92	2
93	2
94	2
95	2
96	2
97	1
98	2
99	2
100	0
101	1
102	12
103	1
104	2
105	12
106	2
107	1
108	4
109	1
110	12
111	2
112	2
113	1
114	12
115	2
116	2
117	2
118	2
119	2
120	164
121	0
122	2
123	2
124	2
125	0
126	44
127	1
128	0

n	a(n)
1	0
2	1
3	1
4	0
5	1
6	2
7	1
8	0
9	0
10	2
11	1
12	2
13	1
14	2
15	2
16	0
17	1
18	2
19	1
20	2
21	2
22	2
23	1
24	2
25	0
26	2
27	0
28	2
29	1
30	12
31	1
32	0
33	2
34	2
35	2
36	0
37	1
38	2
39	2
40	2
41	1
42	12
43	1
44	2
45	2
46	2
47	1
48	2
49	0
50	2
51	2
52	2
53	1
54	2
55	2
56	2
57	2
58	2
59	1
60	44
61	1
62	2
63	2
64	0
65	2
66	12
67	1
68	2
69	2
70	12
71	1
72	4
73	1
74	2
75	2
76	2
77	2
78	12
79	1
80	2
81	0
82	2
83	1
84	44
85	2
86	2
87	2
88	2
89	1
90	44
91	2
92	2
93	2
94	2
95	2
96	2
97	1
98	2
99	2
100	0
101	1
102	12
103	1
104	2
105	12
106	2
107	1
108	4
109	1
110	12
111	2
112	2
113	1
114	12
115	2
116	2
117	2
118	2
119	2
120	164
121	0
122	2
123	2
124	2
125	0
126	44
127	1
128	0