A374433 - cp's OEIS frontend

A374433 Triangle read by rows: T(n, k) = Product_{p in PF(n) intersect PF(k)} p, where PF(a) is the set of the prime factors of a.

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

[1, 1, 1, 1, 1, 2, 1, 1, 1, 3, 1, 1, 2, 1, 2, 1, 1, 1, 1, 1, 5, 1, 1, 2, 3, 2, 1, 6, 1, 1, 1, 1, 1, 1, 1, 7, 1, 1, 2, 1, 2, 1, 2, 1, 2, 1, 1, 1, 3, 1, 1, 3, 1, 1, 3, 1, 1, 2, 1, 2, 5, 2, 1, 2, 1, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 11, 1, 1, 2, 3, 2, 1, 6, 1, 2, 3, 2, 1, 6]

cp's OEIS Frontend

A374433 Triangle read by rows: T(n, k) = Product_{p in PF(n) intersect PF(k)} p, where PF(a) is the set of the prime factors of a.

Table of values

List of values

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

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

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