A122415 - cp's OEIS frontend

A122415 Triangle T(n,k) for 1 < k < n read by rows, where T(n,k) = 1 if gcd(n,k) is prime, 0 otherwise.

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

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

cp's OEIS Frontend

A122415 Triangle T(n,k) for 1 < k < n read by rows, where T(n,k) = 1 if gcd(n,k) is prime, 0 otherwise.

Table of values

List of values

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

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

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