A374435 - cp's OEIS frontend

A374435 Triangle read by rows: T(n, k) = Product_{p in PF(n) difference 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	2
4	2
5	1
6	3
7	3
8	3
9	1
10	2
11	2
12	1
13	2
14	1
15	5
16	5
17	5
18	5
19	5
20	1
21	6
22	6
23	3
24	2
25	3
26	6
27	1
28	7
29	7
30	7
31	7
32	7
33	7
34	7
35	1
36	2
37	2
38	1
39	2
40	1
41	2
42	1
43	2
44	1
45	3
46	3
47	3
48	1
49	3
50	3
51	1
52	3
53	3
54	1
55	10
56	10
57	5
58	10
59	5
60	2
61	5
62	10
63	5
64	10
65	1
66	11
67	11
68	11
69	11
70	11
71	11
72	11
73	11
74	11
75	11
76	11
77	1

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

cp's OEIS Frontend

A374435 Triangle read by rows: T(n, k) = Product_{p in PF(n) difference 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	2
4	2
5	1
6	3
7	3
8	3
9	1
10	2
11	2
12	1
13	2
14	1
15	5
16	5
17	5
18	5
19	5
20	1
21	6
22	6
23	3
24	2
25	3
26	6
27	1
28	7
29	7
30	7
31	7
32	7
33	7
34	7
35	1
36	2
37	2
38	1
39	2
40	1
41	2
42	1
43	2
44	1
45	3
46	3
47	3
48	1
49	3
50	3
51	1
52	3
53	3
54	1
55	10
56	10
57	5
58	10
59	5
60	2
61	5
62	10
63	5
64	10
65	1
66	11
67	11
68	11
69	11
70	11
71	11
72	11
73	11
74	11
75	11
76	11
77	1

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

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