A374434 - cp's OEIS frontend

A374434 Triangle read by rows: T(n, k) = Product_{p in PF(n) symmetric 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	6
9	1
10	2
11	2
12	1
13	6
14	1
15	5
16	5
17	10
18	15
19	10
20	1
21	6
22	6
23	3
24	2
25	3
26	30
27	1
28	7
29	7
30	14
31	21
32	14
33	35
34	42
35	1
36	2
37	2
38	1
39	6
40	1
41	10
42	3
43	14
44	1
45	3
46	3
47	6
48	1
49	6
50	15
51	2
52	21
53	6
54	1
55	10
56	10
57	5
58	30
59	5
60	2
61	15
62	70
63	5
64	30
65	1
66	11
67	11
68	22
69	33
70	22
71	55
72	66
73	77
74	22
75	33
76	110
77	1

[1, 1, 1, 2, 2, 1, 3, 3, 6, 1, 2, 2, 1, 6, 1, 5, 5, 10, 15, 10, 1, 6, 6, 3, 2, 3, 30, 1, 7, 7, 14, 21, 14, 35, 42, 1, 2, 2, 1, 6, 1, 10, 3, 14, 1, 3, 3, 6, 1, 6, 15, 2, 21, 6, 1, 10, 10, 5, 30, 5, 2, 15, 70, 5, 30, 1, 11, 11, 22, 33, 22, 55, 66, 77, 22, 33, 110, 1]

cp's OEIS Frontend

A374434 Triangle read by rows: T(n, k) = Product_{p in PF(n) symmetric 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	6
9	1
10	2
11	2
12	1
13	6
14	1
15	5
16	5
17	10
18	15
19	10
20	1
21	6
22	6
23	3
24	2
25	3
26	30
27	1
28	7
29	7
30	14
31	21
32	14
33	35
34	42
35	1
36	2
37	2
38	1
39	6
40	1
41	10
42	3
43	14
44	1
45	3
46	3
47	6
48	1
49	6
50	15
51	2
52	21
53	6
54	1
55	10
56	10
57	5
58	30
59	5
60	2
61	15
62	70
63	5
64	30
65	1
66	11
67	11
68	22
69	33
70	22
71	55
72	66
73	77
74	22
75	33
76	110
77	1

n	a(n)
0	1
1	1
2	1
3	2
4	2
5	1
6	3
7	3
8	6
9	1
10	2
11	2
12	1
13	6
14	1
15	5
16	5
17	10
18	15
19	10
20	1
21	6
22	6
23	3
24	2
25	3
26	30
27	1
28	7
29	7
30	14
31	21
32	14
33	35
34	42
35	1
36	2
37	2
38	1
39	6
40	1
41	10
42	3
43	14
44	1
45	3
46	3
47	6
48	1
49	6
50	15
51	2
52	21
53	6
54	1
55	10
56	10
57	5
58	30
59	5
60	2
61	15
62	70
63	5
64	30
65	1
66	11
67	11
68	22
69	33
70	22
71	55
72	66
73	77
74	22
75	33
76	110
77	1

n	a(n)
0	1
1	1
2	1
3	2
4	2
5	1
6	3
7	3
8	6
9	1
10	2
11	2
12	1
13	6
14	1
15	5
16	5
17	10
18	15
19	10
20	1
21	6
22	6
23	3
24	2
25	3
26	30
27	1
28	7
29	7
30	14
31	21
32	14
33	35
34	42
35	1
36	2
37	2
38	1
39	6
40	1
41	10
42	3
43	14
44	1
45	3
46	3
47	6
48	1
49	6
50	15
51	2
52	21
53	6
54	1
55	10
56	10
57	5
58	30
59	5
60	2
61	15
62	70
63	5
64	30
65	1
66	11
67	11
68	22
69	33
70	22
71	55
72	66
73	77
74	22
75	33
76	110
77	1