A101605 - cp's OEIS frontend

A101605 a(n) = 1 if n is a product of exactly 3 (not necessarily distinct) primes, otherwise 0.

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

[0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 1, 0]

cp's OEIS Frontend

A101605 a(n) = 1 if n is a product of exactly 3 (not necessarily distinct) primes, otherwise 0.

Table of values

List of values

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

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

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